diff --git a/tests/libtest/lib506.c b/tests/libtest/lib506.c
index 91137fb978..91ccb4ab27 100644
--- a/tests/libtest/lib506.c
+++ b/tests/libtest/lib506.c
@@ -129,7 +129,7 @@ char *suburl(char *base, int i)
 /* test function */
 int test(char *URL)
 {
-  CURLcode res;
+  int res;
   CURLSHcode scode;
   char *url;
   struct Tdata tdata;