diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 9053314881..73092b9c11 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -552,7 +552,7 @@ void MPV_common_init_mlib(MpegEncContext *s);
 void MPV_common_init_mmi(MpegEncContext *s);
 #endif
 #ifdef ARCH_ARMV4L
-    MPV_common_init_armv4l(MpegEncContext *s);
+void MPV_common_init_armv4l(MpegEncContext *s);
 #endif
 #ifdef ARCH_POWERPC
 void MPV_common_init_ppc(MpegEncContext *s);