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--- a/Allura/allura/config/app_cfg.py
+++ b/Allura/allura/config/app_cfg.py
@@ -26,7 +26,7 @@
 
 import allura
 # needed for tg.configuration to work
-from allura.lib import app_globals
+from allura.lib import app_globals, helpers
 
 log = logging.getLogger(__name__)
 
@@ -62,6 +62,7 @@
             autoescape=True,
             extensions=['jinja2.ext.do', 'jinja2.ext.i18n'])
         jinja2_env.install_gettext_translations(pylons.i18n)
+        jinja2_env.filters['filesizeformat'] = helpers.do_filesizeformat
         config['pylons.app_globals'].jinja2_env = jinja2_env
         # Jinja's unable to request c's attributes without strict_c
         config['pylons.strict_c'] = True