diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c
index 61cdc90116..d41d807e64 100644
--- a/libavcodec/ffv1dec_template.c
+++ b/libavcodec/ffv1dec_template.c
@@ -149,7 +149,7 @@ static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int
             }
 
             if (lbd)
-                *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
+                *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + ((unsigned)g<<8) + ((unsigned)r<<16) + ((unsigned)a<<24);
             else if (sizeof(TYPE) == 4) {
                 *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g;
                 *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b;