diff --git a/Library/Homebrew/dev-cmd/install-bundler-gems.rb b/Library/Homebrew/dev-cmd/install-bundler-gems.rb
index a4e5956bce..efa6ec6d4d 100644
--- a/Library/Homebrew/dev-cmd/install-bundler-gems.rb
+++ b/Library/Homebrew/dev-cmd/install-bundler-gems.rb
@@ -32,6 +32,7 @@ module Homebrew
           Homebrew.forget_user_gem_groups!
         end
 
+        Process::UID.change_privilege(Process.euid) if Process.euid != Process.uid
         Homebrew.install_bundler_gems!(groups:)
       end
     end