diff --git a/libswresample/swresample_test.c b/libswresample/swresample_test.c
index 1b1c9030ca..5f88f6af27 100644
--- a/libswresample/swresample_test.c
+++ b/libswresample/swresample_test.c
@@ -21,6 +21,7 @@
 #include "libavutil/avassert.h"
 #include "libavutil/common.h"
 #include "libavutil/audioconvert.h"
+#include "libavutil/opt.h"
 #include "swresample.h"
 #undef fprintf