diff --git a/devtools/shared/gcli/commands/moz.build b/devtools/shared/gcli/commands/moz.build
index 4cc8c103774..eb3fb38a8ed 100644
--- a/devtools/shared/gcli/commands/moz.build
+++ b/devtools/shared/gcli/commands/moz.build
@@ -17,6 +17,7 @@ DevToolsModules(
     'inject.js',
     'jsb.js',
     'listen.js',
+    'mdn.js',
     'measure.js',
     'media.js',
     'pagemod.js',