diff --git a/Xext/mbuf.c b/Xext/mbuf.c
index 827603204c..336ef194f5 100644
--- a/Xext/mbuf.c
+++ b/Xext/mbuf.c
@@ -1106,6 +1106,8 @@ SClobberNotifyEvent (from, to)
     to->state = from->state;
 }
 
+RegionPtr CreateUnclippedWinSize(WindowPtr pWin);
+
 RegionPtr
 CreateUnclippedWinSize (WindowPtr pWin)
 {
diff --git a/include/window.h b/include/window.h
index 8c25799f5b..6fb2f8c185 100644
--- a/include/window.h
+++ b/include/window.h
@@ -156,8 +156,6 @@ extern _X_EXPORT void GetWindowAttributes(
     ClientPtr /*client*/,
     xGetWindowAttributesReply* /* wa */);
 
-extern RegionPtr CreateUnclippedWinSize(WindowPtr);
-
 extern _X_EXPORT void GravityTranslate(
     int /*x*/,
     int /*y*/,