diff --git a/lib/url.h b/lib/url.h
index 446b3d91a..4db324ad4 100644
--- a/lib/url.h
+++ b/lib/url.h
@@ -47,7 +47,7 @@ CURLcode Curl_protocol_doing(struct connectdata *conn, bool *done);
 void Curl_safefree(void *ptr);
 
 /* create a connection cache */
-struct conncache *Curl_mk_connc(int type, int amount);
+struct conncache *Curl_mk_connc(int type, long amount);
 /* free a connection cache */
 void Curl_rm_connc(struct conncache *c);
 /* Change number of entries of a connection cache */