diff --git a/Library/Homebrew/formula_cellar_checks.rb b/Library/Homebrew/formula_cellar_checks.rb
index 7d074d571c..f7ffc988f0 100644
--- a/Library/Homebrew/formula_cellar_checks.rb
+++ b/Library/Homebrew/formula_cellar_checks.rb
@@ -210,6 +210,7 @@ module FormulaCellarChecks
   end
 
   def check_repository_references(prefix)
+    return if HOMEBREW_PREFIX != HOMEBREW_REPOSITORY
     return unless prefix.directory?
 
     keg = Keg.new(prefix)