diff --git a/Shell/Parser.cpp b/Shell/Parser.cpp
index d7d173cb98e..e3c43c0ed44 100644
--- a/Shell/Parser.cpp
+++ b/Shell/Parser.cpp
@@ -959,6 +959,9 @@ RefPtr<AST::Node> Parser::parse_list_expression()
 RefPtr<AST::Node> Parser::parse_expression()
 {
     auto rule_start = push_start();
+    if (m_rule_start_offsets.size() > max_allowed_nested_rule_depth)
+        return create<AST::SyntaxError>(String::formatted("Expression nested too deep (max allowed is {})", max_allowed_nested_rule_depth));
+
     auto starting_char = peek();
 
     auto read_concat = [&](auto&& expr) -> NonnullRefPtr<AST::Node> {
diff --git a/Shell/Parser.h b/Shell/Parser.h
index cf5ee4eb6de..5fe34308b56 100644
--- a/Shell/Parser.h
+++ b/Shell/Parser.h
@@ -51,6 +51,7 @@ public:
     SavedOffset save_offset() const;
 
 private:
+    constexpr static size_t max_allowed_nested_rule_depth = 2048;
     RefPtr<AST::Node> parse_toplevel();
     RefPtr<AST::Node> parse_sequence();
     RefPtr<AST::Node> parse_function_decl();