diff --git a/pylons_app/controllers/error.py b/pylons_app/controllers/error.py
--- a/pylons_app/controllers/error.py
+++ b/pylons_app/controllers/error.py
@@ -9,6 +9,7 @@ from pylons_app.lib.base import BaseCont
 from pylons.middleware import  media_path
 from pylons_app.lib.utils import check_repo
 import pylons_app.lib.helpers as h
+from pylons_app import __version__
 log = logging.getLogger(__name__)
 
 class ErrorController(BaseController):
@@ -38,6 +39,7 @@ class ErrorController(BaseController):
         if resp.status_int == 404:
             org_e = request.environ.get('pylons.original_request').environ
             c.repo_name = repo_name = org_e['PATH_INFO'].split('/')[1]
+            c.hg_app_version = __version__
             c.repo_name_cleaned = h.repo_name_slug(c.repo_name)
             if check_repo(repo_name, g.base_path):
                 return render('/errors/error_404.html')