diff --git a/Library/Homebrew/bottle_version.rb b/Library/Homebrew/bottle_version.rb
index 8cb447229c..348d9c9717 100644
--- a/Library/Homebrew/bottle_version.rb
+++ b/Library/Homebrew/bottle_version.rb
@@ -49,6 +49,10 @@ class BottleVersion < Version
     m = /-(\d{2})/.match(stem)
     return m.captures.first unless m.nil?
 
+    # e.g. p17 from psutils-p17.yosemite.bottle.tar.gz
+    m = /-(p\d{2})/.match(stem)
+    return m.captures.first unless m.nil?
+
     super
   end
 end