diff --git a/lib/npm-info.js b/lib/npm-info.js
index 50ee4450..a773b3a7 100644
--- a/lib/npm-info.js
+++ b/lib/npm-info.js
@@ -5,7 +5,8 @@ var request = require('request')
 var efh = require('./error').efh
 
 module.exports = function (pkgName, cb) {
-  request(process.env.npm_config_registry + pkgName, efh(cb)(function (response, body) {
+  var encodedPkgName = pkgName.replace(/\//g, '%2F')
+  request(process.env.npm_config_registry + encodedPkgName, efh(cb)(function (response, body) {
     var res = {
       version: null,
       gitHead: null,