diff --git a/Library/Homebrew/dev-cmd/pr-pull.rb b/Library/Homebrew/dev-cmd/pr-pull.rb
index 80a75e5703..258c2e8c26 100644
--- a/Library/Homebrew/dev-cmd/pr-pull.rb
+++ b/Library/Homebrew/dev-cmd/pr-pull.rb
@@ -161,10 +161,10 @@ module Homebrew
     package_name = package_file.basename.to_s.chomp(".rb")
 
     odebug "Cherry-picking #{package_file}: #{commit}"
-    Utils::Git.cherry_pick!(git_repo, commit, verbose: verbose, resolve: resolve)
+    Utils::Git.cherry_pick!(git_repo.to_s, commit, verbose: verbose, resolve: resolve)
 
-    old_package = Utils::Git.file_at_commit(git_repo, file, "HEAD^")
-    new_package = Utils::Git.file_at_commit(git_repo, file, "HEAD")
+    old_package = Utils::Git.file_at_commit(git_repo.to_s, file, "HEAD^")
+    new_package = Utils::Git.file_at_commit(git_repo.to_s, file, "HEAD")
 
     bump_subject = determine_bump_subject(old_package, new_package, package_file, reason: reason).strip
     subject, body, trailers = separate_commit_message(git_repo.commit_message)
diff --git a/Library/Homebrew/git_repository.rb b/Library/Homebrew/git_repository.rb
index ba5aab4024..83a312c425 100644
--- a/Library/Homebrew/git_repository.rb
+++ b/Library/Homebrew/git_repository.rb
@@ -109,6 +109,11 @@ class GitRepository
     popen_git("log", "-1", "--pretty=%B", commit, "--", safe: safe, err: :out)&.strip
   end
 
+  sig { returns(String) }
+  def to_s
+    pathname.to_s
+  end
+
   private
 
   sig { params(args: T.untyped, safe: T::Boolean, err: T.nilable(Symbol)).returns(T.nilable(String)) }