diff --git a/packages/rocketchat-theme-colors/server/server.coffee b/packages/rocketchat-theme-colors/server/server.coffee
index 55b2a9945d9..55902c5ce73 100644
--- a/packages/rocketchat-theme-colors/server/server.coffee
+++ b/packages/rocketchat-theme-colors/server/server.coffee
@@ -98,6 +98,5 @@ WebApp.connectHandlers.use '/theme-colors.css', (req, res, next) ->
 	res.setHeader 'Cache-Control', 'no-cache'
 	res.setHeader 'Pragma', 'no-cache'
 	res.setHeader 'Expires', '0'
-	res.setHeader 'Content-Length', css.length * 8
 
 	res.end css