diff --git a/common/ruletypes.h b/common/ruletypes.h
index bb6264359..c92e4c4dc 100644
--- a/common/ruletypes.h
+++ b/common/ruletypes.h
@@ -450,6 +450,8 @@ RULE_BOOL(Spells, TargetsTargetRequiresCombatRange, true, "Disable to remove com
 RULE_BOOL(Spells, NPCBuffLevelRestrictions, false, "Impose BuffLevelRestrictions on NPCs if true")
 RULE_INT(Spells, ResurrectionEffectBlock, 2, "0 = allow overwrites/rule disabled. If set to 1 = Block all buffs that would overwrite Resurrection Effects. If set to 2 = Will not overwrite Resurrection Effects, instead moves new buff to an empty slot if available. Default is 2.")
 RULE_BOOL(Spells, WaterMatchRequiredForLoS, true, "Enable/Disable the requirement of both the attacker/victim being both in or out of water for spells LoS to pass.")
+RULE_INT(Spells, WizardCritMinimumRandomRatio, 20, "The minimum value for the random range which Wizards and Caster DPS Mercs innately have for spell crit ratio. Set to 20 for vanilla values.")
+RULE_INT(Spells, WizardCritMaximumRandomRatio, 70, "The maximum value for the random range which Wizards and Caster DPS Mercs innately have for spell crit ratio. Set to 70 for vanilla values.")
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(Combat)
diff --git a/zone/effects.cpp b/zone/effects.cpp
index 0570251f2..c7d3ff34a 100644
--- a/zone/effects.cpp
+++ b/zone/effects.cpp
@@ -95,7 +95,7 @@ int64 Mob::GetActSpellDamage(uint16 spell_id, int64 value, Mob* target) {
 		else if ((IsOfClientBot() && GetClass() == WIZARD) || (IsMerc() && GetClass() == CASTERDPS)) {
 			if ((GetLevel() >= RuleI(Spells, WizCritLevel)) && zone->random.Roll(RuleI(Spells, WizCritChance))){
 				//Wizard innate critical chance is calculated seperately from spell effect and is not a set ratio. (20-70 is parse confirmed)
-				ratio += zone->random.Int(20,70);
+				ratio += zone->random.Int(RuleI(Spells, WizardCritMinimumRandomRatio), RuleI(Spells, WizardCritMaximumRandomRatio));
 				Critical = true;
 			}
 		}