diff --git a/Library/Homebrew/dev-cmd/install-bundler-gems.rb b/Library/Homebrew/dev-cmd/install-bundler-gems.rb
index efa6ec6d4d422..a4e5956bcebe3 100644
--- a/Library/Homebrew/dev-cmd/install-bundler-gems.rb
+++ b/Library/Homebrew/dev-cmd/install-bundler-gems.rb
@@ -32,7 +32,6 @@ def run
           Homebrew.forget_user_gem_groups!
         end
 
-        Process::UID.change_privilege(Process.euid) if Process.euid != Process.uid
         Homebrew.install_bundler_gems!(groups:)
       end
     end
diff --git a/Library/Homebrew/utils/gems.rb b/Library/Homebrew/utils/gems.rb
index dc60f5b847aee..717a5a006c651 100644
--- a/Library/Homebrew/utils/gems.rb
+++ b/Library/Homebrew/utils/gems.rb
@@ -300,7 +300,12 @@ def install_bundler_gems!(only_warn_on_failure: false, setup_path: true, groups:
       end
 
       bundle_installed = if bundle_install_required
-        if system bundle, "install", out: :err
+        Process.wait(fork do
+          # Native build scripts fail if EUID != UID
+          Process::UID.change_privilege(Process.euid) if Process.euid != Process.uid
+          exec bundle, "install", out: :err
+        end)
+        if $CHILD_STATUS.success?
           true
         else
           message = <<~EOS