diff --git a/hw/xwin/winwindowswm.c b/hw/xwin/winwindowswm.c
index 88c375733..01ae088e8 100644
--- a/hw/xwin/winwindowswm.c
+++ b/hw/xwin/winwindowswm.c
@@ -491,7 +491,7 @@ ProcWindowsWMFrameSetTitle(ClientPtr client)
 #endif
 
     title_bytes = malloc(title_length + 1);
-    strncpy(title_bytes, (unsigned char *) &stuff[1], title_length);
+    strncpy(title_bytes, (char *) &stuff[1], title_length);
     title_bytes[title_length] = '\0';
 
     pRLWinPriv = (win32RootlessWindowPtr) RootlessFrameForWindow(pWin, FALSE);