diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index ff301bbcf2..4f4075b076 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -218,7 +218,7 @@ end
 
 def ignore_interrupts(opt = nil)
   std_trap = trap("INT") do
-    puts "One sec, just cleaning up" unless opt = :quietly
+    puts "One sec, just cleaning up" unless opt == :quietly
   end
   yield
 ensure