diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index 167ea9134ae1b..a924c07d01a2a 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -148,7 +148,7 @@ def run
         new_mirrors ||= args.mirror
         if new_url.present? && (new_mirror = determine_mirror(new_url))
           new_mirrors ||= [new_mirror]
-          check_for_mirrors(formula, old_mirrors, new_mirrors)
+          check_for_mirrors(formula.name, old_mirrors, new_mirrors)
         end
 
         old_hash = formula_spec.checksum&.hexdigest