diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h.orig b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h
index 8b76c0f..c8c5369 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h.orig
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Threading.h
@@ -89,7 +89,7 @@
 #include <pthread.h>
 #elif PLATFORM(GTK)
 #include <wtf/gtk/GOwnPtr.h>
-typedef struct _GMutex GMutex;
+typedef union _GMutex GMutex;
 typedef struct _GCond GCond;
 #endif
 
diff --git a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/gobject/GTypedefs.h.orig b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/gobject/GTypedefs.h
index c7f7ac4..f00e9cf 100644
--- a/src/3rdparty/webkit/Source/JavaScriptCore/wtf/gobject/GTypedefs.h.orig
+++ b/src/3rdparty/webkit/Source/JavaScriptCore/wtf/gobject/GTypedefs.h
@@ -52,7 +52,7 @@ typedef struct _GFile GFile;
 typedef struct _GHashTable GHashTable;
 typedef struct _GInputStream GInputStream;
 typedef struct _GList GList;
-typedef struct _GMutex GMutex;
+typedef union _GMutex GMutex;
 typedef struct _GPatternSpec GPatternSpec;
 typedef struct _GPollableOutputStream GPollableOutputStream;
 typedef struct _GSocketClient GSocketClient;