diff --git a/common/ruletypes.h b/common/ruletypes.h
index 99909e08a..77d9d4dfb 100644
--- a/common/ruletypes.h
+++ b/common/ruletypes.h
@@ -562,6 +562,7 @@ RULE_INT(Combat, ClassicTripleAttackChanceWarrior, 100, "Innate Chance for Warri
 RULE_INT(Combat, ClassicTripleAttackChanceMonk, 100, "Innate Chance for Monk to Triple Attack after a Double Attack (200 = 20%). DEFAULT: 100")
 RULE_INT(Combat, ClassicTripleAttackChanceBerserker, 100, "Innate Chance for Berserker to Triple Attack after a Double Attack (200 = 20%). DEFAULT: 100")
 RULE_INT(Combat, ClassicTripleAttackChanceRanger, 100, "Innate Chance for Ranger to Triple Attack after a Double Attack (200 = 20%). DEFAULT: 100")
+RULE_INT(Combat, StunChance, 12, "Percent chance that client will be stunned when mob is behind player. DEFAULT: 12")
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(NPC)
diff --git a/zone/attack.cpp b/zone/attack.cpp
index 585761bc0..aadcbbebb 100644
--- a/zone/attack.cpp
+++ b/zone/attack.cpp
@@ -1419,7 +1419,7 @@ void Mob::DoAttack(Mob *other, DamageHitInfo &hit, ExtraAttackOptions *opts, boo
 		if (other->CheckHitChance(this, hit)) {
 			if (IsNPC() && other->IsClient() && other->animation > 0 && GetLevel() >= 5 && BehindMob(other, GetX(), GetY())) {
 				// ~ 12% chance
-				if (zone->random.Roll(12)) {
+				if (zone->random.Roll(RuleI(Combat, StunChance))) {
 					int stun_resist2 = other->spellbonuses.FrontalStunResist + other->itembonuses.FrontalStunResist + other->aabonuses.FrontalStunResist;
 					int stun_resist = other->spellbonuses.StunResist + other->itembonuses.StunResist + other->aabonuses.StunResist;
 					if (zone->random.Roll(stun_resist2)) {