diff --git a/test/testdata/knownExtensions.js b/test/testdata/knownExtensions.js
index 0d48bb3..a66f0b7 100644
--- a/test/testdata/knownExtensions.js
+++ b/test/testdata/knownExtensions.js
@@ -9,6 +9,7 @@ import {
   REACT_PERF,
   CYCLEJS_DEVTOOL,
   APOLLO_DEVELOPER_TOOLS,
+  MOBX_DEVTOOLS,
 } from '../../src/';
 
 const knownExtensions = [
@@ -52,6 +53,10 @@ const knownExtensions = [
     ...APOLLO_DEVELOPER_TOOLS,
     description: 'Apollo Client Developer Tools',
   },
+  {
+    ...MOBX_DEVTOOLS,
+    description: 'MobX Developer Tools',
+  },
 ];
 
 export default knownExtensions;