diff --git a/src/adapter.js b/src/adapter.js
index 176f050..f6e0e80 100644
--- a/src/adapter.js
+++ b/src/adapter.js
@@ -8,7 +8,7 @@ var formatError = function (error) {
     }
 
     // remove mocha stack entries
-    return stack.replace(/\n.+\/mocha\/mocha.js\?\w*\:.+(?=(\n|$))/g, '')
+    return stack.replace(/\n.+\/mocha\/mocha.js\?\w*:.+(?=(\n|$))/g, '')
   }
 
   return message