diff --git a/lib/adapter.js b/lib/adapter.js
index 1600d8d..65a7807 100644
--- a/lib/adapter.js
+++ b/lib/adapter.js
@@ -21,6 +21,10 @@ const EVENTS = {
     'pending': 'test:pending'
 }
 
+const allowedKeys = Object.keys(INTERFACES).reduce((prev, curr) => {
+    return prev.concat(INTERFACES[curr])
+}, [])
+
 const NOOP = function () {}
 const SETTLE_TIMEOUT = 5000
 
@@ -72,7 +76,7 @@ class MochaAdapter {
     async run () {
         let {mochaOpts} = this.config
 
-        if (typeof mochaOpts.ui !== 'string' || !INTERFACES[mochaOpts.ui]) {
+        if (typeof mochaOpts.ui !== 'string') {
             mochaOpts.ui = 'bdd'
         }
 
@@ -89,9 +93,16 @@ class MochaAdapter {
                 context, file, mocha, options: mochaOpts
             })
 
-            INTERFACES[mochaOpts.ui].forEach((fnName) => {
-                let testCommand = INTERFACES[mochaOpts.ui][2]
+            let interfaceCommandsArray = INTERFACES[mochaOpts.ui]
+            let testCommand
+            if (!interfaceCommandsArray) {
+                interfaceCommandsArray = Object.keys(global).filter(key => allowedKeys.indexOf(key) > -1)
+                testCommand = interfaceCommandsArray.indexOf('it') > -1 ? 'it' : 'test'
+            } else {
+                testCommand = interfaceCommandsArray[2]
+            }
 
+            interfaceCommandsArray.forEach((fnName) => {
                 runInFiberContext(
                     [testCommand, testCommand + '.only'],
                     this.config.beforeHook,