diff --git a/Library/Homebrew/bottle_version.rb b/Library/Homebrew/bottle_version.rb
index 0711dc3494..38b51005eb 100644
--- a/Library/Homebrew/bottle_version.rb
+++ b/Library/Homebrew/bottle_version.rb
@@ -3,12 +3,12 @@ class BottleVersion < Version
     spec = Pathname.new(spec) unless spec.is_a? Pathname
     stem = spec.stem
 
-    # e.g. perforce-2013.1.610569-x86_64
+    # e.g. perforce-2013.1.610569-x86_64.mountain_lion.bottle.tar.gz
     m = /-([\d\.]+-x86(_64)?)/.match(stem)
     return m.captures.first unless m.nil?
 
-    # e.g. ssh-copy-id-6.2p2.bottle.tar.gz
-    # e.g. icu4c-52.1.bottle.tar.gz
+    # e.g. ssh-copy-id-6.2p2.mountain_lion.bottle.tar.gz
+    # e.g. icu4c-52.1.mountain_lion.bottle.tar.gz
     m = /(\d+\.(\d)+(p(\d)+)?)/.match(stem)
     return m.captures.first unless m.nil?
 
diff --git a/Library/Homebrew/test/test_bottle_versions.rb b/Library/Homebrew/test/test_bottle_versions.rb
index 7624f448a3..26efb1261d 100644
--- a/Library/Homebrew/test/test_bottle_versions.rb
+++ b/Library/Homebrew/test/test_bottle_versions.rb
@@ -18,6 +18,6 @@ class BottleVersionParsingTests < Test::Unit::TestCase
 
   def test_icu4c_style
     assert_version_detected '52.1',
-      '/usr/local/icu4c-52.1.bottle.tar.gz'
+      '/usr/local/icu4c-52.1.mavericks.bottle.tar.gz'
   end
 end