diff --git a/libavcodec/h264_mvpred.h b/libavcodec/h264_mvpred.h
index 5f1e9a1ee5..03dc7352fe 100644
--- a/libavcodec/h264_mvpred.h
+++ b/libavcodec/h264_mvpred.h
@@ -243,7 +243,7 @@ static av_always_inline void pred_8x16_motion(H264Context *const h,
             if (IS_INTERLACED(type)) {          \
                 refn >>= 1;                     \
                 AV_COPY32(mvbuf[idx], mvn);     \
-                mvbuf[idx][1] <<= 1;            \
+                mvbuf[idx][1] *= 2;             \
                 mvn = mvbuf[idx];               \
             }                                   \
         }                                       \