diff --git a/libavfilter/parseutils.c b/libavfilter/parseutils.c
index b74533b40c..47f72ca8f0 100644
--- a/libavfilter/parseutils.c
+++ b/libavfilter/parseutils.c
@@ -65,7 +65,7 @@ char *av_get_token(const char **buf, const char *term)
 
 #undef printf
 
-int main()
+int main(void)
 {
     int i;