gistfile.patch

diff --git a/index.js b/index.js
index 2324e7f..c52adf8 100644
--- a/index.js
+++ b/index.js
@@ -21,15 +21,25 @@ const urlIsValid = u => {
   }
 }
 
+const parsePublishConfig = (publishConfig = {}) => {
+  const opt = {}
+  for (const [key, value] of publishConfig) {
+    if (key === 'registry' || /^(@|\/\/)/.test(key)) {
+      opts[key] = value
+    }
+  }
+  return opt
+}
+
 module.exports = regFetch
 function regFetch (uri, /* istanbul ignore next */ opts_ = {}) {
   const opts = {
     ...defaultOpts,
-    ...opts_
+    ...opts_,
+    ...parsePublishConfig(opts_.publishConfig)
   }
   const registry = opts.registry = (
     (opts.spec && pickRegistry(opts.spec, opts)) ||
-    (opts.publishConfig && opts.publishConfig.registry) ||
     opts.registry ||
     /* istanbul ignore next */
     'https://registry.npmjs.org/'