diff --git a/Library/Homebrew/test/test_versions.rb b/Library/Homebrew/test/test_versions.rb
index c5671ce827..e1e4e2dcff 100644
--- a/Library/Homebrew/test/test_versions.rb
+++ b/Library/Homebrew/test/test_versions.rb
@@ -297,4 +297,9 @@ class VersionParsingTests < Test::Unit::TestCase
     assert_version_detected '2.4c',
       'http://loop-aes.sourceforge.net/aespipe/aespipe-v2.4c.tar.bz2'
   end
+
+  def test_perforce_style
+    assert_version_detected '2013.1.610569-x86_64',
+      '/usr/local/perforce-2013.1.610569-x86_64.mountain_lion.bottle.tar.gz'
+  end
 end
diff --git a/Library/Homebrew/version.rb b/Library/Homebrew/version.rb
index 07d042eb1d..7cc347a03e 100644
--- a/Library/Homebrew/version.rb
+++ b/Library/Homebrew/version.rb
@@ -237,6 +237,10 @@ class Version
     m = /[-_]([Rr]\d+[AaBb]\d*(?:-\d+)?)/.match(spec_s)
     return m.captures.first unless m.nil?
 
+    # e.g. perforce-2013.1.610569-x86_64
+    m = /-([\d\.]+-x86(_64)?)/.match(stem)
+    return m.captures.first unless m.nil?
+
     # e.g. boost_1_39_0
     m = /((?:\d+_)+\d+)$/.match(stem)
     return m.captures.first.gsub('_', '.') unless m.nil?