diff --git a/Library/Homebrew/unpack_strategy/compress.rb b/Library/Homebrew/unpack_strategy/compress.rb
index 952e17c980..d435b9a599 100644
--- a/Library/Homebrew/unpack_strategy/compress.rb
+++ b/Library/Homebrew/unpack_strategy/compress.rb
@@ -5,7 +5,7 @@ module UnpackStrategy
     using Magic
 
     def self.extensions
-      [".compress"]
+      [".Z"]
     end
 
     def self.can_extract?(path)