diff --git a/Userland/DevTools/Profiler/TimelineHeader.h b/Userland/DevTools/Profiler/TimelineHeader.h
index 35892de55d..f429cbb0cb 100644
--- a/Userland/DevTools/Profiler/TimelineHeader.h
+++ b/Userland/DevTools/Profiler/TimelineHeader.h
@@ -11,7 +11,7 @@
 namespace Profiler {
 
 class Profile;
-class Process;
+struct Process;
 
 class TimelineHeader final : public GUI::Frame {
     C_OBJECT(TimelineHeader);
diff --git a/Userland/DevTools/Profiler/TimelineTrack.h b/Userland/DevTools/Profiler/TimelineTrack.h
index 9bbb97c59f..5a9ded5cc7 100644
--- a/Userland/DevTools/Profiler/TimelineTrack.h
+++ b/Userland/DevTools/Profiler/TimelineTrack.h
@@ -11,7 +11,7 @@
 
 namespace Profiler {
 
-class Process;
+struct Process;
 class Profile;
 class TimelineView;
 
diff --git a/Userland/Libraries/LibIPC/Stub.h b/Userland/Libraries/LibIPC/Stub.h
index a4ac5aec21..a4a02808dc 100644
--- a/Userland/Libraries/LibIPC/Stub.h
+++ b/Userland/Libraries/LibIPC/Stub.h
@@ -16,7 +16,7 @@ class BufferStream;
 namespace IPC {
 
 class Message;
-class MessageBuffer;
+struct MessageBuffer;
 
 class Stub {
 public:
diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index d82e0d8c22..320287fe2c 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -60,7 +60,7 @@ namespace Web::HTML {
 class CanvasRenderingContext2D;
 class CloseEvent;
 class DOMParser;
-class EventHandler;
+struct EventHandler;
 class HTMLAnchorElement;
 class HTMLAreaElement;
 class HTMLAudioElement;
diff --git a/Userland/Services/WindowServer/Compositor.h b/Userland/Services/WindowServer/Compositor.h
index c493627f38..cbb9e8819d 100644
--- a/Userland/Services/WindowServer/Compositor.h
+++ b/Userland/Services/WindowServer/Compositor.h
@@ -212,7 +212,7 @@ private:
             return iterate_flush_rects(m_flush_transparent_rects);
         }
     };
-    friend class ScreenData;
+    friend struct ScreenData;
     Vector<ScreenData, default_screen_count> m_screen_data;
 
     IntrusiveList<Overlay, RawPtr<Overlay>, &Overlay::m_list_node> m_overlay_list;