diff --git a/data/ai/micro_ais/cas/ca_wolves_move.lua b/data/ai/micro_ais/cas/ca_wolves_move.lua
index a41337a08a1..7432cb76500 100644
--- a/data/ai/micro_ais/cas/ca_wolves_move.lua
+++ b/data/ai/micro_ais/cas/ca_wolves_move.lua
@@ -11,7 +11,10 @@ local function get_wolves(cfg)
 end
 
 local function get_prey(cfg)
-    local prey = AH.get_attackable_enemies(H.get_child(cfg, "filter_second"))
+    -- Note: we cannot pass H.get_child() directly to AH.get_attackable_enemies()
+    -- as the former returns two values and the latter takes optional arguments
+    local filter_second = H.get_child(cfg, "filter_second")
+    local prey = AH.get_attackable_enemies(filter_second)
     return prey
 end