diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 6f8667c8e5..aca76b492c 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -79,12 +79,7 @@ class FormulaInstaller
     end
 
     unless ignore_deps
-      # HACK: If readline is present in the dependency tree, it will clash
-      # with the stdlib's Readline module when the debugger is loaded
-      if f.recursive_dependencies.any? { |d| d.name == "readline" } and ARGV.debug?
-        ENV['HOMEBREW_NO_READLINE'] = '1'
-      end
-
+      perform_readline_hack
       check_requirements
       install_dependencies
     end
@@ -118,6 +113,14 @@ class FormulaInstaller
     opoo "Nothing was installed to #{f.prefix}" unless f.installed?
   end
 
+  # HACK: If readline is present in the dependency tree, it will clash
+  # with the stdlib's Readline module when the debugger is loaded
+  def perform_readline_hack
+    if f.recursive_dependencies.any? { |d| d.name == "readline" } && ARGV.debug?
+      ENV['HOMEBREW_NO_READLINE'] = '1'
+    end
+  end
+
   def check_requirements
     unsatisfied = ARGV.filter_for_dependencies do
       f.recursive_requirements do |dependent, req|