diff --git a/libavcodec/vc1dsp.c b/libavcodec/vc1dsp.c
index 960db5602f..3b352d6d83 100644
--- a/libavcodec/vc1dsp.c
+++ b/libavcodec/vc1dsp.c
@@ -771,23 +771,25 @@ static void avg_no_rnd_vc1_chroma_mc8_c(uint8_t *dst /* align 8 */,
     }
 }
 
-static void avg_no_rnd_vc1_chroma_mc4_c(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int stride, int h, int x, int y){
-    const int A=(8-x)*(8-y);
-    const int B=(  x)*(8-y);
-    const int C=(8-x)*(  y);
-    const int D=(  x)*(  y);
+static void avg_no_rnd_vc1_chroma_mc4_c(uint8_t *dst /* align 8 */,
+                                        uint8_t *src /* align 1 */,
+                                        int stride, int h, int x, int y)
+{
+    const int A = (8 - x) * (8 - y);
+    const int B = (    x) * (8 - y);
+    const int C = (8 - x) * (    y);
+    const int D = (    x) * (    y);
     int i;
 
-    av_assert2(x<8 && y<8 && x>=0 && y>=0);
+    av_assert2(x < 8 && y < 8 && x >= 0 && y >= 0);
 
-    for(i=0; i<h; i++)
-    {
-        dst[0] = avg2(dst[0], ((A*src[0] + B*src[1] + C*src[stride+0] + D*src[stride+1] + 32 - 4) >> 6));
-        dst[1] = avg2(dst[1], ((A*src[1] + B*src[2] + C*src[stride+1] + D*src[stride+2] + 32 - 4) >> 6));
-        dst[2] = avg2(dst[2], ((A*src[2] + B*src[3] + C*src[stride+2] + D*src[stride+3] + 32 - 4) >> 6));
-        dst[3] = avg2(dst[3], ((A*src[3] + B*src[4] + C*src[stride+3] + D*src[stride+4] + 32 - 4) >> 6));
-        dst+= stride;
-        src+= stride;
+    for (i = 0; i < h; i++) {
+        dst[0] = avg2(dst[0], chroma_mc(0));
+        dst[1] = avg2(dst[1], chroma_mc(1));
+        dst[2] = avg2(dst[2], chroma_mc(2));
+        dst[3] = avg2(dst[3], chroma_mc(3));
+        dst += stride;
+        src += stride;
     }
 }