diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 6ebf3f6a49..29e61b6963 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -93,7 +93,7 @@ class ArchRequirement < Requirement
   fatal true
 
   def initialize(arch)
-    @arch = arch
+    @arch = arch.pop
     super
   end