diff --git a/libavcodec/mpeg4video.h b/libavcodec/mpeg4video.h
index 619fcd8fa8..97c39b6ed6 100644
--- a/libavcodec/mpeg4video.h
+++ b/libavcodec/mpeg4video.h
@@ -101,7 +101,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s);
 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
 int ff_mpeg4_decode_video_packet_header(MpegEncContext *s);
 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
-int ff_mpeg4videodec_static_init(void);
+void ff_mpeg4videodec_static_init(void);
 
 /**
  *
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index b78f735a77..a55ab3474e 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2255,7 +2255,7 @@ end:
     return decode_vop_header(s, gb);
 }
 
-av_cold int ff_mpeg4videodec_static_init(void) {
+av_cold void ff_mpeg4videodec_static_init(void) {
     static int done = 0;
 
     if (!done) {