diff --git a/Library/Homebrew/utils/github.rb b/Library/Homebrew/utils/github.rb
index c934012d28..903116d46d 100644
--- a/Library/Homebrew/utils/github.rb
+++ b/Library/Homebrew/utils/github.rb
@@ -680,7 +680,7 @@ module GitHub
 
   private_class_method def self.add_auth_token_to_url!(url)
     if API.credentials_type == :env_token
-      url.sub!(%r{^https://github\.com/}, "https://#{API.credentials}@github.com/")
+      url.sub!(%r{^https://github\.com/}, "https://x-access-token:#{API.credentials}@github.com/")
     end
     url
   end