diff --git a/bin/_mocha b/bin/_mocha
index f8068835f6..13c369f55c 100755
--- a/bin/_mocha
+++ b/bin/_mocha
@@ -95,6 +95,7 @@ program
   .option('--throw-deprecation', 'throw an exception anytime a deprecated function is used')
   .option('--trace', 'trace function calls')
   .option('--trace-deprecation', 'show stack traces on deprecations')
+  .option('--use_strict', 'enforce strict mode')
   .option('--watch-extensions <ext>,...', 'additional extensions to monitor with --watch', list, [])
   .option('--delay', 'wait for async suite definition')
 
@@ -207,6 +208,7 @@ mocha.ui(program.ui);
 
 // load reporter
 
+var Reporter = null;
 try {
   Reporter = require('../lib/reporters/' + program.reporter);
 } catch (err) {
diff --git a/bin/mocha b/bin/mocha
index 031ef56bff..ebc517784d 100755
--- a/bin/mocha
+++ b/bin/mocha
@@ -34,6 +34,7 @@ process.argv.slice(2).forEach(function(arg){
     case '--prof':
     case '--throw-deprecation':
     case '--trace-deprecation':
+    case '--use_strict':
     case '--allow-natives-syntax':
       args.unshift(arg);
       break;