diff --git a/src/warden-server/etc/warden-server.conf.tmpl.update b/src/warden-server/etc/warden-server.conf.tmpl.update
index 12a8586a274854a89db6c5bbcb6bcda131243c3e..878cd71b710bd4bbbaed697f6b193fa8ac0ec679 100644
--- a/src/warden-server/etc/warden-server.conf.tmpl.update
+++ b/src/warden-server/etc/warden-server.conf.tmpl.update
@@ -52,5 +52,5 @@ $MAX_EVENTS_LIMIT = "_MAX_EVENTS_LIMIT_";
 # VALID_STRINGS - validation hash containing allowed event attributes
 #-------------------------------------------------------------------------------
 %VALID_STRINGS = (
-"_VALID_STRINGS"
+_VALID_STRINGS_
 );