diff --git a/Applications/FileManager/DirectoryView.cpp b/Applications/FileManager/DirectoryView.cpp
index d0f4abf557a..d77c139f0dd 100644
--- a/Applications/FileManager/DirectoryView.cpp
+++ b/Applications/FileManager/DirectoryView.cpp
@@ -282,7 +282,7 @@ void DirectoryView::update_statusbar()
     current_view().selection().for_each_index([&](auto& index) {
         auto& model = *current_view().model();
         auto size_index = model.sibling(index.row(), GFileSystemModel::Column::Size, model.parent_index(index));
-        auto file_size = model.data(size_index).to_int();
+        auto file_size = model.data(size_index).to_i32();
         selected_byte_count += file_size;
     });
 
diff --git a/Applications/SystemMonitor/ProcessTableView.cpp b/Applications/SystemMonitor/ProcessTableView.cpp
index 05589d15da6..bec942b6ae0 100644
--- a/Applications/SystemMonitor/ProcessTableView.cpp
+++ b/Applications/SystemMonitor/ProcessTableView.cpp
@@ -56,5 +56,5 @@ pid_t ProcessTableView::selected_pid() const
 {
     if (selection().is_empty())
         return -1;
-    return model()->data(model()->index(selection().first().row(), ProcessModel::Column::PID), GModel::Role::Sort).as_int();
+    return model()->data(model()->index(selection().first().row(), ProcessModel::Column::PID), GModel::Role::Sort).as_i32();
 }
diff --git a/Applications/SystemMonitor/main.cpp b/Applications/SystemMonitor/main.cpp
index 578e0b47f11..8a551a0567a 100644
--- a/Applications/SystemMonitor/main.cpp
+++ b/Applications/SystemMonitor/main.cpp
@@ -258,7 +258,7 @@ public:
     virtual void paint(GPainter& painter, const Rect& a_rect, const Palette& palette, const GModel& model, const GModelIndex& index) override
     {
         auto rect = a_rect.shrunken(2, 2);
-        auto percentage = model.data(index, GModel::Role::Custom).to_int();
+        auto percentage = model.data(index, GModel::Role::Custom).to_i32();
 
         auto data = model.data(index, GModel::Role::Display);
         String text;
diff --git a/DevTools/VisualBuilder/VBForm.cpp b/DevTools/VisualBuilder/VBForm.cpp
index c289ef4f841..cb844cfa9fc 100644
--- a/DevTools/VisualBuilder/VBForm.cpp
+++ b/DevTools/VisualBuilder/VBForm.cpp
@@ -431,8 +431,10 @@ void VBForm::write_to_file(const String& path)
         widget.for_each_property([&](auto& property) {
             if (property.value().is_bool())
                 widget_object.set(property.name(), property.value().to_bool());
-            else if (property.value().is_int())
-                widget_object.set(property.name(), property.value().to_int());
+            else if (property.value().is_i32())
+                widget_object.set(property.name(), property.value().to_i32());
+            else if (property.value().is_i64())
+                widget_object.set(property.name(), property.value().to_i64());
             else
                 widget_object.set(property.name(), property.value().to_string());
         });
diff --git a/DevTools/VisualBuilder/VBPropertiesWindow.cpp b/DevTools/VisualBuilder/VBPropertiesWindow.cpp
index ae557a8c6c9..6965e31b38f 100644
--- a/DevTools/VisualBuilder/VBPropertiesWindow.cpp
+++ b/DevTools/VisualBuilder/VBPropertiesWindow.cpp
@@ -95,7 +95,7 @@ VBPropertiesWindow::VBPropertiesWindow()
         if (!m_table_view->model())
             return nullptr;
         auto type_index = m_table_view->model()->index(index.row(), VBWidgetPropertyModel::Column::Type);
-        auto type = m_table_view->model()->data(type_index, GModel::Role::Custom).to_int();
+        auto type = m_table_view->model()->data(type_index, GModel::Role::Custom).to_i32();
         switch ((GVariant::Type)type) {
         case GVariant::Type::Bool:
             return make<BoolModelEditingDelegate>();
diff --git a/DevTools/VisualBuilder/VBWidget.cpp b/DevTools/VisualBuilder/VBWidget.cpp
index a7d7f43213e..96862f5d859 100644
--- a/DevTools/VisualBuilder/VBWidget.cpp
+++ b/DevTools/VisualBuilder/VBWidget.cpp
@@ -140,10 +140,10 @@ void VBWidget::setup_properties()
 {
     VB_ADD_PROPERTY(CObject, "name", name, set_name, string);
 
-    VB_ADD_PROPERTY(GWidget, "width", width, set_width, int);
-    VB_ADD_PROPERTY(GWidget, "height", height, set_height, int);
-    VB_ADD_PROPERTY(GWidget, "x", x, set_x, int);
-    VB_ADD_PROPERTY(GWidget, "y", y, set_y, int);
+    VB_ADD_PROPERTY(GWidget, "width", width, set_width, i32);
+    VB_ADD_PROPERTY(GWidget, "height", height, set_height, i32);
+    VB_ADD_PROPERTY(GWidget, "x", x, set_x, i32);
+    VB_ADD_PROPERTY(GWidget, "y", y, set_y, i32);
     VB_ADD_PROPERTY(GWidget, "visible", is_visible, set_visible, bool);
     VB_ADD_PROPERTY(GWidget, "enabled", is_enabled, set_enabled, bool);
     VB_ADD_PROPERTY(GWidget, "tooltip", tooltip, set_tooltip, string);
@@ -164,28 +164,28 @@ void VBWidget::setup_properties()
     }
 
     if (m_type == VBWidgetType::GScrollBar) {
-        VB_ADD_PROPERTY(GScrollBar, "min", min, set_min, int);
-        VB_ADD_PROPERTY(GScrollBar, "max", max, set_max, int);
-        VB_ADD_PROPERTY(GScrollBar, "value", value, set_value, int);
-        VB_ADD_PROPERTY(GScrollBar, "step", step, set_step, int);
+        VB_ADD_PROPERTY(GScrollBar, "min", min, set_min, i32);
+        VB_ADD_PROPERTY(GScrollBar, "max", max, set_max, i32);
+        VB_ADD_PROPERTY(GScrollBar, "value", value, set_value, i32);
+        VB_ADD_PROPERTY(GScrollBar, "step", step, set_step, i32);
     }
 
     if (m_type == VBWidgetType::GSpinBox) {
-        VB_ADD_PROPERTY(GSpinBox, "min", min, set_min, int);
-        VB_ADD_PROPERTY(GSpinBox, "max", max, set_max, int);
-        VB_ADD_PROPERTY(GSpinBox, "value", value, set_value, int);
+        VB_ADD_PROPERTY(GSpinBox, "min", min, set_min, i32);
+        VB_ADD_PROPERTY(GSpinBox, "max", max, set_max, i32);
+        VB_ADD_PROPERTY(GSpinBox, "value", value, set_value, i32);
     }
 
     if (m_type == VBWidgetType::GProgressBar) {
-        VB_ADD_PROPERTY(GProgressBar, "min", min, set_min, int);
-        VB_ADD_PROPERTY(GProgressBar, "max", max, set_max, int);
-        VB_ADD_PROPERTY(GProgressBar, "value", value, set_value, int);
+        VB_ADD_PROPERTY(GProgressBar, "min", min, set_min, i32);
+        VB_ADD_PROPERTY(GProgressBar, "max", max, set_max, i32);
+        VB_ADD_PROPERTY(GProgressBar, "value", value, set_value, i32);
     }
 
     if (m_type == VBWidgetType::GSlider) {
-        VB_ADD_PROPERTY(GSlider, "min", min, set_min, int);
-        VB_ADD_PROPERTY(GSlider, "max", max, set_max, int);
-        VB_ADD_PROPERTY(GSlider, "value", value, set_value, int);
+        VB_ADD_PROPERTY(GSlider, "min", min, set_min, i32);
+        VB_ADD_PROPERTY(GSlider, "max", max, set_max, i32);
+        VB_ADD_PROPERTY(GSlider, "value", value, set_value, i32);
     }
 
     if (m_type == VBWidgetType::GTextEditor) {
diff --git a/Libraries/LibGUI/GVariant.cpp b/Libraries/LibGUI/GVariant.cpp
index cfe43a70adf..676e81837ea 100644
--- a/Libraries/LibGUI/GVariant.cpp
+++ b/Libraries/LibGUI/GVariant.cpp
@@ -30,19 +30,34 @@
 const char* to_string(GVariant::Type type)
 {
     switch (type) {
-    case GVariant::Type::Invalid: return "Invalid";
-    case GVariant::Type::Bool: return "Bool";
-    case GVariant::Type::Int: return "Int";
-    case GVariant::Type::UnsignedInt: return "UnsignedInt";
-    case GVariant::Type::Float: return "Float";
-    case GVariant::Type::String: return "String";
-    case GVariant::Type::Bitmap: return "Bitmap";
-    case GVariant::Type::Color: return "Color";
-    case GVariant::Type::Icon: return "Icon";
-    case GVariant::Type::Point: return "Point";
-    case GVariant::Type::Size: return "Size";
-    case GVariant::Type::Rect: return "Rect";
-    case GVariant::Type::Font: return "Font";
+    case GVariant::Type::Invalid:
+        return "Invalid";
+    case GVariant::Type::Bool:
+        return "Bool";
+    case GVariant::Type::Int32:
+        return "Int32";
+    case GVariant::Type::Int64:
+        return "Int64";
+    case GVariant::Type::UnsignedInt:
+        return "UnsignedInt";
+    case GVariant::Type::Float:
+        return "Float";
+    case GVariant::Type::String:
+        return "String";
+    case GVariant::Type::Bitmap:
+        return "Bitmap";
+    case GVariant::Type::Color:
+        return "Color";
+    case GVariant::Type::Icon:
+        return "Icon";
+    case GVariant::Type::Point:
+        return "Point";
+    case GVariant::Type::Size:
+        return "Size";
+    case GVariant::Type::Rect:
+        return "Rect";
+    case GVariant::Type::Font:
+        return "Font";
     }
     ASSERT_NOT_REACHED();
 }
@@ -76,10 +91,16 @@ void GVariant::clear()
     m_value.as_string = nullptr;
 }
 
-GVariant::GVariant(int value)
-    : m_type(Type::Int)
+GVariant::GVariant(i32 value)
+    : m_type(Type::Int32)
 {
-    m_value.as_int = value;
+    m_value.as_i32 = value;
+}
+
+GVariant::GVariant(i64 value)
+    : m_type(Type::Int64)
+{
+    m_value.as_i64 = value;
 }
 
 GVariant::GVariant(unsigned value)
@@ -120,8 +141,8 @@ GVariant::GVariant(const JsonValue& value)
     }
 
     if (value.is_i32()) {
-        m_type = Type::Int;
-        m_value.as_int = value.as_i32();
+        m_type = Type::Int32;
+        m_value.as_i32 = value.as_i32();
         return;
     }
 
@@ -132,9 +153,8 @@ GVariant::GVariant(const JsonValue& value)
     }
 
     if (value.is_i64()) {
-        // FIXME: GVariant should have a 64-bit internal type.
-        m_type = Type::Int;
-        m_value.as_int = value.to_i32();
+        m_type = Type::Int64;
+        m_value.as_i64 = value.as_i64();
         return;
     }
 
@@ -239,8 +259,11 @@ void GVariant::copy_from(const GVariant& other)
     case Type::Bool:
         m_value.as_bool = other.m_value.as_bool;
         break;
-    case Type::Int:
-        m_value.as_int = other.m_value.as_int;
+    case Type::Int32:
+        m_value.as_i32 = other.m_value.as_i32;
+        break;
+    case Type::Int64:
+        m_value.as_i64 = other.m_value.as_i64;
         break;
     case Type::UnsignedInt:
         m_value.as_uint = other.m_value.as_uint;
@@ -288,8 +311,10 @@ bool GVariant::operator==(const GVariant& other) const
     switch (m_type) {
     case Type::Bool:
         return as_bool() == other.as_bool();
-    case Type::Int:
-        return as_int() == other.as_int();
+    case Type::Int32:
+        return as_i32() == other.as_i32();
+    case Type::Int64:
+        return as_i64() == other.as_i64();
     case Type::UnsignedInt:
         return as_uint() == other.as_uint();
     case Type::Float:
@@ -323,8 +348,10 @@ bool GVariant::operator<(const GVariant& other) const
     switch (m_type) {
     case Type::Bool:
         return as_bool() < other.as_bool();
-    case Type::Int:
-        return as_int() < other.as_int();
+    case Type::Int32:
+        return as_i32() < other.as_i32();
+    case Type::Int64:
+        return as_i64() < other.as_i64();
     case Type::UnsignedInt:
         return as_uint() < other.as_uint();
     case Type::Float:
@@ -356,8 +383,10 @@ String GVariant::to_string() const
     switch (m_type) {
     case Type::Bool:
         return as_bool() ? "true" : "false";
-    case Type::Int:
-        return String::number(as_int());
+    case Type::Int32:
+        return String::number(as_i32());
+    case Type::Int64:
+        return String::number(as_i64());
     case Type::UnsignedInt:
         return String::number(as_uint());
     case Type::Float:
diff --git a/Libraries/LibGUI/GVariant.h b/Libraries/LibGUI/GVariant.h
index 581611625c1..a3fde901b40 100644
--- a/Libraries/LibGUI/GVariant.h
+++ b/Libraries/LibGUI/GVariant.h
@@ -40,7 +40,8 @@ public:
     GVariant();
     GVariant(bool);
     GVariant(float);
-    GVariant(int);
+    GVariant(i32);
+    GVariant(i64);
     GVariant(unsigned);
     GVariant(const char*);
     GVariant(const String&);
@@ -65,7 +66,8 @@ public:
     enum class Type {
         Invalid,
         Bool,
-        Int,
+        Int32,
+        Int64,
         UnsignedInt,
         Float,
         String,
@@ -80,7 +82,8 @@ public:
 
     bool is_valid() const { return m_type != Type::Invalid; }
     bool is_bool() const { return m_type == Type::Bool; }
-    bool is_int() const { return m_type == Type::Int; }
+    bool is_i32() const { return m_type == Type::Int32; }
+    bool is_i64() const { return m_type == Type::Int64; }
     bool is_uint() const { return m_type == Type::UnsignedInt; }
     bool is_float() const { return m_type == Type::Float; }
     bool is_string() const { return m_type == Type::String; }
@@ -105,8 +108,10 @@ public:
             return as_bool();
         if (type() == Type::String)
             return !!m_value.as_string;
-        if (type() == Type::Int)
-            return m_value.as_int != 0;
+        if (type() == Type::Int32)
+            return m_value.as_i32 != 0;
+        if (type() == Type::Int64)
+            return m_value.as_i64 != 0;
         if (type() == Type::UnsignedInt)
             return m_value.as_uint != 0;
         if (type() == Type::Rect)
@@ -118,10 +123,16 @@ public:
         return is_valid();
     }
 
-    int as_int() const
+    int as_i32() const
     {
-        ASSERT(type() == Type::Int);
-        return m_value.as_int;
+        ASSERT(type() == Type::Int32);
+        return m_value.as_i32;
+    }
+
+    int as_i64() const
+    {
+        ASSERT(type() == Type::Int64);
+        return m_value.as_i64;
     }
 
     unsigned as_uint() const
@@ -130,10 +141,13 @@ public:
         return m_value.as_uint;
     }
 
-    int to_int() const
+    template<typename T>
+    T to_integer() const
     {
-        if (is_int())
-            return as_int();
+        if (is_i32())
+            return as_i32();
+        if (is_i64())
+            return as_i64();
         if (is_bool())
             return as_bool() ? 1 : 0;
         if (is_float())
@@ -152,6 +166,16 @@ public:
         return 0;
     }
 
+    i32 to_i32() const
+    {
+        return to_integer<i32>();
+    }
+
+    i64 to_i64() const
+    {
+        return to_integer<i64>();
+    }
+
     float as_float() const
     {
         ASSERT(type() == Type::Float);
@@ -244,7 +268,8 @@ private:
         GIconImpl* as_icon;
         Font* as_font;
         bool as_bool;
-        int as_int;
+        i32 as_i32;
+        i64 as_i64;
         unsigned as_uint;
         float as_float;
         RGBA32 as_color;