diff --git a/app/__init__.py b/app/__init__.py
index 4fc506f34..39ea3f285 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -162,6 +162,9 @@ def create_app(application):
 
     init_app(application)
 
+    if 'extensions' not in application.jinja_options:
+        application.jinja_options['extensions'] = []
+
     init_govuk_frontend(application)
     init_jinja(application)