diff --git a/data/ai/micro_ais/cas/ca_recruit_rushers.lua b/data/ai/micro_ais/cas/ca_recruit_rushers.lua
index eff899e5004d..04f9e5953759 100644
--- a/data/ai/micro_ais/cas/ca_recruit_rushers.lua
+++ b/data/ai/micro_ais/cas/ca_recruit_rushers.lua
@@ -1,5 +1,6 @@
 local internal_recruit_cas = {}
 local internal_params = {}
+local ai
 
 -- The following external engine creates the CA functions recruit_rushers_eval and recruit_rushers_exec
 -- It also exposes find_best_recruit and find_best_recruit_hex for use by other recruit engines