diff --git a/ChangeLog b/ChangeLog
index ac64ce612..428f056dd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-06-24  Neil Roberts  <neil@o-hand.com>
+
+	Bug 979 - Wrong call convension for SwapIntervalProc in win32 backend
+
+	* clutter/win32/clutter-backend-win32.c: Use the correct calling
+	convention for SwapInterval. Thanks to Haakon Sporsheim.
+
 2008-06-24  Emmanuele Bassi  <ebassi@openedhand.com>
 
 	Bug 989 - Add a search path for clutter script assets
diff --git a/clutter/win32/clutter-backend-win32.c b/clutter/win32/clutter-backend-win32.c
index e5c2be3a3..186a987c1 100644
--- a/clutter/win32/clutter-backend-win32.c
+++ b/clutter/win32/clutter-backend-win32.c
@@ -40,7 +40,7 @@
 G_DEFINE_TYPE (ClutterBackendWin32, clutter_backend_win32,
 	       CLUTTER_TYPE_BACKEND);
 
-typedef int (* SwapIntervalProc) (int interval);
+typedef int (WINAPI * SwapIntervalProc) (int interval);
 
 /* singleton object */
 static ClutterBackendWin32 *backend_singleton = NULL;