diff --git a/conf.d/celeryconfig.py.erb b/conf.d/celeryconfig.py.erb
index 7cbcd09..54d98b8 100644
--- a/conf.d/celeryconfig.py.erb
+++ b/conf.d/celeryconfig.py.erb
@@ -1,11 +1,11 @@
 ## Broker settings.
-BROKER_URL = 'mongodb://%s:%d/celery_tasks' % (<%= ENV['OPENSHIFT_MONGODB_DB_HOST'] %>, <%= ENV['OPENSHIFT_MONGODB_DB_PORT'] %>)
+BROKER_URL = 'mongodb://%s:%d/celery_tasks' % ("<%= ENV['OPENSHIFT_MONGODB_DB_HOST'] %>", <%= ENV['OPENSHIFT_MONGODB_DB_PORT'] %>)
 
 # List of modules to import when celery starts.
 CELERY_IMPORTS = ("<%= ENV['OPENSHIFT_CELERY_IMPORTS'] %>", )
 
 ## Using the database to store task state and results.
 CELERY_RESULT_BACKEND = "mongodb"
-CELERY_RESULT_DBURI = 'mongodb://%s:%d/celery_tasks' % (<%= ENV['OPENSHIFT_MONGODB_DB_HOST'] %>, <%= ENV['OPENSHIFT_MONGODB_DB_PORT'] %>)
+CELERY_RESULT_DBURI = 'mongodb://%s:%d/celery_tasks' % ("<%= ENV['OPENSHIFT_MONGODB_DB_HOST'] %>", <%= ENV['OPENSHIFT_MONGODB_DB_PORT'] %>)
 
 CELERY_ANNOTATIONS = {"tasks.add": {"rate_limit": "10/s"}}