diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index dbed1cf22b..df32e8870d 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -5,7 +5,7 @@ require 'mach'
 class Pathname
   include MachO
 
-  BOTTLE_EXTNAME_RX = /(\.[a-z_]+\.bottle\.(\d+\.)?tar\.gz)$/
+  BOTTLE_EXTNAME_RX = /(\.[a-z_]+(32)?\.bottle\.(\d+\.)?tar\.gz)$/
 
   def install *sources
     results = []