diff --git a/nanoc/lib/mixin.rb b/nanoc/lib/mixin.rb
index d70f6ab..2455f57 100644
--- a/nanoc/lib/mixin.rb
+++ b/nanoc/lib/mixin.rb
@@ -15,7 +15,7 @@ module Mixin
   end
 
   def revision
-    ["v#{app_version}", " ", "(#{cmd("git rev-parse HEAD").stdout.strip})"].join
+    cmd("git rev-parse HEAD").stdout.strip
   end
 
   def build_dir