diff --git a/config.js b/config.js
index 86d6fa5f..b7976850 100644
--- a/config.js
+++ b/config.js
@@ -1,7 +1,8 @@
 (function () {
   var options = {}
-  process.argv.forEach(function (val, idx, arr) {
-    var matches = val.match(/^dotenv_config_(.+)=(.+)/)
+  // skip first argv, which is node command
+  process.argv.slice(1).forEach(function (val) {
+    var matches = val.match(/^dotenv_config_([^=]+)=(.+)$/)
     if (matches) {
       options[matches[1]] = matches[2]
     }