diff --git a/lib/testosterone.js b/lib/testosterone.js
index 77d4ad6..b6f2037 100644
--- a/lib/testosterone.js
+++ b/lib/testosterone.js
@@ -5,6 +5,8 @@
  */
 require('colors');
 
+var FAILURE_EXIT_CODE = 1;
+
 module.exports = function (config) {
 
   var _util = require('util')
@@ -36,7 +38,7 @@ module.exports = function (config) {
                 require('assert')[fn].apply(this, [].slice.call(arguments, 0));
               } catch (exc) {
                 console.error(('\n✗ => ' + exc.stack + '\n').red);
-                process.exit();
+                process.exit(FAILURE_EXIT_CODE);
               }
               _passed_asserts += 1;
               _util.print('✓ '.green);