diff --git a/toolkit/mozapps/webextensions/moz.build b/toolkit/mozapps/webextensions/moz.build
index f6e83a355b..3898521eb9 100644
--- a/toolkit/mozapps/webextensions/moz.build
+++ b/toolkit/mozapps/webextensions/moz.build
@@ -32,8 +32,8 @@ EXTRA_JS_MODULES += [
     '../extensions/DeferredSave.jsm',
     '../extensions/GMPUtils.jsm',
     'AddonManager.jsm',
-    'LightweightThemeManager.jsm',
     'GMPInstallManager.jsm',
+    'LightweightThemeManager.jsm',
 ]
 
 JAR_MANIFESTS += ['jar.mn']