diff --git a/libavformat/rtmpdh.c b/libavformat/rtmpdh.c
index c52af9aa13..4f20588372 100644
--- a/libavformat/rtmpdh.c
+++ b/libavformat/rtmpdh.c
@@ -371,6 +371,9 @@ fail:
 }
 
 #ifdef TEST
+
+#include <stdio.h>
+
 static int test_random_shared_secret(void)
 {
     FF_DH *peer1 = NULL, *peer2 = NULL;