diff --git a/Source/WebKit/UIProcess/gtk/ClipboardGtk4.cpp b/Source/WebKit/UIProcess/gtk/ClipboardGtk4.cpp
index 4fd9616c5f7f..c6faa02957c7 100644
--- a/Source/WebKit/UIProcess/gtk/ClipboardGtk4.cpp
+++ b/Source/WebKit/UIProcess/gtk/ClipboardGtk4.cpp
@@ -34,6 +34,7 @@
 #include <WebCore/SharedBuffer.h>
 #include <gtk/gtk.h>
 #include <wtf/glib/GRefPtr.h>
+#include <wtf/glib/GUniquePtr.h>
 
 namespace WebKit {