diff --git a/Library/Homebrew/requirement.rb b/Library/Homebrew/requirement.rb
index d4da0255a0..317675b739 100644
--- a/Library/Homebrew/requirement.rb
+++ b/Library/Homebrew/requirement.rb
@@ -140,9 +140,9 @@ class Requirement
       formulae = dependent.recursive_dependencies.map(&:to_formula)
       formulae.unshift(dependent)
 
-      formulae.map(&:requirements).each do |requirements|
-        requirements.each do |req|
-          if prune?(dependent, req, &block)
+      formulae.each do |f|
+        f.requirements.each do |req|
+          if prune?(f, req, &block)
             next
           else
             reqs << req