diff --git a/src/common/kernel/combatspells.c b/src/common/kernel/combatspells.c
index 1f339f046..70fd88aa7 100644
--- a/src/common/kernel/combatspells.c
+++ b/src/common/kernel/combatspells.c
@@ -895,7 +895,7 @@ sp_chaosrow(fighter * fi, int level, int force, spell * sp)
 			if (df->unit->race->battle_flags & BF_NOBLOCK) {
 				df->side->nonblockers[row] -= df->alive;
 			}
-			row = FIRST_ROW + (rand()% NUMROWS);
+			row = FIRST_ROW + (rand()%(NUMROWS-1));
 			switch (row) {
 				case FIGHT_ROW:
 					df->status = ST_FIGHT;