diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 4590bf96c9..61b2b608c4 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -131,7 +131,7 @@ class FormulaInstaller
       raise "Suspicious installation failure" unless $?.success?
 
       # Write an installation receipt (a Tab) to the prefix
-      Tab.for_install(f, args).write if f.prefix.exist?
+      Tab.for_install(f, args).write if f.installed?
     end
   end