diff --git a/libavfilter/tests/filtfmts.c b/libavfilter/tests/filtfmts.c
index f59199c9a9..199d74d7a9 100644
--- a/libavfilter/tests/filtfmts.c
+++ b/libavfilter/tests/filtfmts.c
@@ -30,6 +30,7 @@
 
 #include "libavfilter/avfilter.h"
 #include "libavfilter/formats.h"
+#include "libavfilter/internal.h"
 
 static void print_formats(AVFilterContext *filter_ctx)
 {