diff --git a/data/apps/cvtt_musvc.cfg b/data/apps/cvtt_musvc.cfg
index b27be3d..4bbf40b 100644
--- a/data/apps/cvtt_musvc.cfg
+++ b/data/apps/cvtt_musvc.cfg
@@ -9,8 +9,8 @@
    
     # new communication settings
     # , "comm_settings": @env{CONFIG_COMM_SETTINGS} # DEPRECATED
-    , "pubsub_settings": @env{PUBSUB_SETTINGS_CONFIG_KEY}
-    , "cache_settings": @env{CACHE_SETTINGS_CONFIG_KEY}
+    , "pubsub_settings": "@env{PUBSUB_SETTINGS_CONFIG_KEY}"
+    , "cache_settings": "@env{CACHE_SETTINGS_CONFIG_KEY}"
 
     , "global_channel_prefix": ${GLOBAL_CHANNEL_PREFIX}