diff --git a/scripts/policy/frameworks/cluster/controller/log.zeek b/scripts/policy/frameworks/cluster/controller/log.zeek
index 49aeb9b282..a0970728e8 100644
--- a/scripts/policy/frameworks/cluster/controller/log.zeek
+++ b/scripts/policy/frameworks/cluster/controller/log.zeek
@@ -32,6 +32,7 @@ export {
 
 	global log_level = DEBUG &redef;
 
+	global debug: function(message: string);
 	global info: function(message: string);
 	global warning: function(message: string);
 	global error: function(message: string);