diff --git a/tests/libtest/lib506.c b/tests/libtest/lib506.c
index 40f72617883b22eb5c72bbd84eec3908a76ff9f3..91137fb97851b2ef37b7871c28c3995f7a09b7f3 100644
--- a/tests/libtest/lib506.c
+++ b/tests/libtest/lib506.c
@@ -87,7 +87,7 @@ void *fire(void *ptr)
   struct curl_slist *headers;
   struct Tdata *tdata = (struct Tdata*)ptr;
   CURL *curl = curl_easy_init();
-  int i;
+  int i=0;
 
   headers = sethost(NULL);
   curl_easy_setopt(curl, CURLOPT_VERBOSE,    1);