diff --git a/libavcodec/put_bits.h b/libavcodec/put_bits.h
index 8858caaacc..8dbbd094df 100644
--- a/libavcodec/put_bits.h
+++ b/libavcodec/put_bits.h
@@ -253,6 +253,7 @@ static inline void skip_put_bits(PutBitContext *s, int n)
 static inline void set_put_bits_buffer_size(PutBitContext *s, int size)
 {
     s->buf_end = s->buf + size;
+    s->size_in_bits = 8*size;
 }
 
 #endif /* AVCODEC_PUT_BITS_H */