diff --git a/hw/xwin/win.h b/hw/xwin/win.h
index 46ccb7884..3660b9623 100644
--- a/hw/xwin/win.h
+++ b/hw/xwin/win.h
@@ -719,7 +719,7 @@ Bool
 winAllocatePrivates (ScreenPtr pScreen);
 
 Bool
-winInitCmapPrivates (ColormapPtr pCmap);
+winInitCmapPrivates (ColormapPtr pCmap, int index);
 
 Bool
 winAllocateCmapPrivates (ColormapPtr pCmap);