diff --git a/ext/interbase/ibase_service.c b/ext/interbase/ibase_service.c
index bc635f3dfc5..6bd98c2092c 100644
--- a/ext/interbase/ibase_service.c
+++ b/ext/interbase/ibase_service.c
@@ -210,7 +210,7 @@ PHP_FUNCTION(ibase_delete_user)
    Connect to the service manager */
 PHP_FUNCTION(ibase_service_attach)
 {
-	long hlen, ulen, plen, spb_len;
+	int hlen, ulen, plen, spb_len;
 	ibase_service *svm;
 	char buf[128], *host, *user, *pass, *loc;
 	isc_svc_handle handle = NULL;