diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 6c241512ad..f78d1eb610 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -350,6 +350,10 @@ class Tap
     return unless private?
     return if quiet
 
+    path.cd do
+      return if Utils.popen_read("git", "config", "--get", "credential.helper").present?
+    end
+
     $stderr.puts <<~EOS
       It looks like you tapped a private repository. To avoid entering your
       credentials each time you update, you can use git HTTP credential