diff --git a/tests/libtest/lib500.c b/tests/libtest/lib500.c
index f78ab5561..7cbc65e3f 100644
--- a/tests/libtest/lib500.c
+++ b/tests/libtest/lib500.c
@@ -1,6 +1,6 @@
 #include "test.h"
 
-CURLcode test(char *URL)
+int test(char *URL)
 {
   CURLcode res;
   CURL *curl = curl_easy_init();