diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index c98ea95e87..dfe68c19c1 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -94,6 +94,7 @@ class Requirement
     # PATH.
     parent = satisfied_result_parent
     return unless parent
+    return if ["#{HOMEBREW_PREFIX}/bin", "#{HOMEBREW_PREFIX}/bin"].include?(parent.to_s)
     return if PATH.new(ENV["PATH"]).include?(parent.to_s)
     ENV.prepend_path("PATH", parent)
   end