diff --git a/lib/https/ca.js b/lib/https/ca.js
index 57b0ba266..ac1b322e0 100644
--- a/lib/https/ca.js
+++ b/lib/https/ca.js
@@ -140,9 +140,9 @@ function loadCustomCerts() {
       if (!/^(.+)\.(crt|key)$/.test(name)) {
         return;
       }
-      var hostname =RegExp.$1;
+      var filename =RegExp.$1;
       var suffix = RegExp.$2;
-      var cert = certs[hostname] = certs[hostname] || {};
+      var cert = certs[filename] = certs[filename] || {};
       if (suffix === 'crt') {
         suffix = 'cert';
       }