diff --git a/lib/main.js b/lib/main.js
index d1b5b8e9..c256633f 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -42,15 +42,15 @@ Lambda.prototype.run = function (program) {
   var filename = splitHandler[0] + '.js';
   var handlername = splitHandler[1];
 
-  var handler = require(process.cwd() + '/' + filename)[handlername];
-  var event = require(process.cwd() + '/' + program.eventFile);
-  var context = require(process.cwd() + '/' + program.contextFile);
-
   // Set custom environment variables if program.configFile is defined
   if (program.configFile) {
     this._setRunTimeEnvironmentVars(program);
   }
 
+  var handler = require(process.cwd() + '/' + filename)[handlername];
+  var event = require(process.cwd() + '/' + program.eventFile);
+  var context = require(process.cwd() + '/' + program.contextFile);
+
   this._runHandler(handler, event, program.runtime, context);
 };