diff --git a/build/gulpfile.hygiene.js b/build/gulpfile.hygiene.js
index bd95e699853..4744ab4513b 100644
--- a/build/gulpfile.hygiene.js
+++ b/build/gulpfile.hygiene.js
@@ -26,6 +26,7 @@ var eolFilter = [
 
 var indentationFilter = [
 	'**',
+	'!**/lib/**',
 	'!**/*.d.ts',
 	'!extensions/typescript/server/**',
 	'!test/assert.js',