diff --git a/lib/testosterone.js b/lib/testosterone.js
index d5232e6..9bebee4 100644
--- a/lib/testosterone.js
+++ b/lib/testosterone.js
@@ -37,7 +37,7 @@ 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(1);
               }
               _passed_asserts += 1;
               _util.print('✓ '.green);