diff --git a/libavcodec/h264_cabac.c b/libavcodec/h264_cabac.c
index c2e183d76b..d4ed266972 100644
--- a/libavcodec/h264_cabac.c
+++ b/libavcodec/h264_cabac.c
@@ -1281,7 +1281,7 @@ void ff_h264_init_cabac_states(H264Context *h) {
 }
 
 static int decode_cabac_field_decoding_flag(H264Context *h) {
-    const long mbb_xy = h->mb_xy - 2L*h->mb_stride;
+    const int mbb_xy = h->mb_xy - 2*h->mb_stride;
 
     unsigned long ctx = 0;