diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 420d73f85e..2b01d7bb72 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -2329,7 +2329,7 @@ static inline void MPV_motion_lowres(MpegEncContext *s,
 /**
  * find the lowest MB row referenced in the MVs
  */
-int ff_mpv_lowest_referenced_row(MpegEncContext *s, int dir)
+static int lowest_referenced_row(MpegEncContext *s, int dir)
 {
     int my_max = INT_MIN, my_min = INT_MAX, qpel_shift = !s->quarter_sample;
     int my, off, i, mvs;
@@ -2524,12 +2524,12 @@ void mpv_decode_mb_internal(MpegEncContext *s, int16_t block[12][64],
                 if(HAVE_THREADS && s->avctx->active_thread_type&FF_THREAD_FRAME) {
                     if (s->mv_dir & MV_DIR_FORWARD) {
                         ff_thread_await_progress(&s->last_picture_ptr->tf,
-                                                 ff_mpv_lowest_referenced_row(s, 0),
+                                                 lowest_referenced_row(s, 0),
                                                  0);
                     }
                     if (s->mv_dir & MV_DIR_BACKWARD) {
                         ff_thread_await_progress(&s->next_picture_ptr->tf,
-                                                 ff_mpv_lowest_referenced_row(s, 1),
+                                                 lowest_referenced_row(s, 1),
                                                  0);
                     }
                 }
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index e538695a98..a35897517a 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -631,8 +631,6 @@ void ff_mpv_report_decode_progress(MpegEncContext *s);
 int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx);
 void ff_mpv_frame_end(MpegEncContext *s);
 
-int ff_mpv_lowest_referenced_row(MpegEncContext *s, int dir);
-
 int ff_mpv_encode_init(AVCodecContext *avctx);
 void ff_mpv_encode_init_x86(MpegEncContext *s);