diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 6fc6625f4c..05de05c1a2 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -454,7 +454,7 @@ class Formula
   end
 
   def pouring
-    @bottle or ARGV.build_from_source?
+    @bottle and not ARGV.build_from_source?
   end
 
 protected