diff --git a/webview/platform/linux/webview_linux_webkit_gtk.h b/webview/platform/linux/webview_linux_webkit_gtk.h
index a7f0f97..c2b21c7 100644
--- a/webview/platform/linux/webview_linux_webkit_gtk.h
+++ b/webview/platform/linux/webview_linux_webkit_gtk.h
@@ -14,6 +14,7 @@ extern "C" {
 #include <gtk/gtk.h>
 #include <webkit2/webkit2.h>
 #include <X11/Xlib.h>
+#include <gdk/gdkx.h>
 #define signals public
 } // extern "C"