diff --git a/libavcodec/h263.c b/libavcodec/h263.c
index d86ee8f81d..ba51c245a6 100644
--- a/libavcodec/h263.c
+++ b/libavcodec/h263.c
@@ -3196,7 +3196,7 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
     }
 
     while(v<=0xFF){
-        if(s->pict_type==B_TYPE || (v>>(8-s->pict_type)!=1))
+        if(s->pict_type==B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
             break;
         skip_bits(&s->gb, 8+s->pict_type);
         bits_count+= 8+s->pict_type;