diff --git a/pixman/src/fbmmx.c b/pixman/src/fbmmx.c
index bc746cf8d..4d603bf78 100644
--- a/pixman/src/fbmmx.c
+++ b/pixman/src/fbmmx.c
@@ -2401,7 +2401,7 @@ fbCopyAreammx (FbPixels	*pSrc,
 	    d += 2;
 	}
 
-	while (w >= 4 && ((unsigned int)d & 7))
+	while (w >= 4 && ((unsigned long)d & 7))
 	{
 	    *(CARD32 *)d = *(CARD32 *)s;