diff --git a/src/lib/sw_engine/tvgSwCommon.h b/src/lib/sw_engine/tvgSwCommon.h
index 55b2e73a..6e78543f 100644
--- a/src/lib/sw_engine/tvgSwCommon.h
+++ b/src/lib/sw_engine/tvgSwCommon.h
@@ -268,8 +268,8 @@ static inline SwCoord TO_SWCOORD(float val)
 
 static inline uint32_t ALPHA_BLEND(uint32_t c, uint32_t a)
 {
-    return (((((c >> 8) & 0x00ff00ff) * a) & 0xff00ff00) +
-            ((((c & 0x00ff00ff) * a) >> 8) & 0x00ff00ff));
+    return (((((c >> 8) & 0x00ff00ff) * a + 0x00ff00ff) & 0xff00ff00) +
+            ((((c & 0x00ff00ff) * a + 0x00ff00ff) >> 8) & 0x00ff00ff));
 }
 
 static inline uint32_t COLOR_INTERPOLATE(uint32_t c1, uint32_t a1, uint32_t c2, uint32_t a2)