diff --git a/Userland/Applications/Piano/AudioPlayerLoop.h b/Userland/Applications/Piano/AudioPlayerLoop.h
index c037af218b1..60e86d88968 100644
--- a/Userland/Applications/Piano/AudioPlayerLoop.h
+++ b/Userland/Applications/Piano/AudioPlayerLoop.h
@@ -15,6 +15,7 @@
 #include <LibCore/Event.h>
 #include <LibCore/Object.h>
 #include <LibDSP/Music.h>
+#include <LibThreading/MutexProtected.h>
 #include <LibThreading/Thread.h>
 
 class TrackManager;
diff --git a/Userland/Libraries/LibCore/EventLoop.h b/Userland/Libraries/LibCore/EventLoop.h
index 75be2f3c81b..7a0b10b5cc7 100644
--- a/Userland/Libraries/LibCore/EventLoop.h
+++ b/Userland/Libraries/LibCore/EventLoop.h
@@ -10,18 +10,11 @@
 
 #include <AK/Forward.h>
 #include <AK/Function.h>
-#include <AK/HashMap.h>
 #include <AK/Noncopyable.h>
 #include <AK/NonnullOwnPtr.h>
-#include <AK/NonnullRefPtr.h>
 #include <AK/Time.h>
-#include <AK/Vector.h>
-#include <AK/WeakPtr.h>
 #include <LibCore/Event.h>
 #include <LibCore/Forward.h>
-#include <LibThreading/MutexProtected.h>
-#include <sys/time.h>
-#include <sys/types.h>
 
 namespace Core {
 
diff --git a/Userland/Libraries/LibIPC/Connection.cpp b/Userland/Libraries/LibIPC/Connection.cpp
index b791b5b8d19..cb3ac35470a 100644
--- a/Userland/Libraries/LibIPC/Connection.cpp
+++ b/Userland/Libraries/LibIPC/Connection.cpp
@@ -8,6 +8,7 @@
 #include <LibCore/System.h>
 #include <LibIPC/Connection.h>
 #include <LibIPC/Stub.h>
+#include <sched.h>
 #include <sys/select.h>
 
 namespace IPC {