diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index d56c29331e..25417f7c4a 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -233,7 +233,11 @@ nsc:
     return dst;
 }
 
-int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src){
+/**
+ * Identify the exact end of the bitstream
+ * @return the length of the trailing, or 0 if damaged
+ */
+static int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src){
     int v= *src;
     int r;
 
diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index 17fd680369..f4f9b25739 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -625,12 +625,6 @@ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
  */
 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
 
-/**
- * Identify the exact end of the bitstream
- * @return the length of the trailing, or 0 if damaged
- */
-int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src);
-
 /**
  * Free any data that may have been allocated in the H264 context like SPS, PPS etc.
  */