diff --git a/src/common/kernel/battle.c b/src/common/kernel/battle.c
index 4c8c8f766..d931ad6d4 100644
--- a/src/common/kernel/battle.c
+++ b/src/common/kernel/battle.c
@@ -153,6 +153,7 @@ static armor_type armordata[AR_NONE + 1] =
 };
 
 #if 0
+/* not in use */
 static void
 validate_sides(battle * b)
 {