diff --git a/fb/fbmmx.c b/fb/fbmmx.c
index d058ffae4..f74930a39 100644
--- a/fb/fbmmx.c
+++ b/fb/fbmmx.c
@@ -591,7 +591,7 @@ mmxCombineSaturateU (CARD32 *dest, const CARD32 *src, int width)
 
         if (sa > da) {
             __m64 msa = load8888(FbIntDiv(da, sa));
-            msa = expand_alpha(msa);
+            msa = expand_alpha_rev(msa);
             ms = pix_multiply(ms, msa);
         }
         md = pix_add(md, ms);