diff --git a/spec/System/TestBifurcatedCrit_spec.lua b/spec/System/TestBifurcatedCrit_spec.lua
index 3a7593d49b..4cea45abf1 100644
--- a/spec/System/TestBifurcatedCrit_spec.lua
+++ b/spec/System/TestBifurcatedCrit_spec.lua
@@ -1,5 +1,5 @@
 describe("Bifurcated critical strikes", function()
-	local function setupBifurcate(socketGroup, bifurcate, lucky, extremeLuck, useDefaultCritMultiplier)
+	local function setupBifurcate(socketGroup, bifurcate, lucky, extremeLuck, useDefaultCritMultiplier, extraMods)
 		newBuild()
 		build.itemsTab:CreateDisplayItemFromRaw([[
 				New Item
@@ -15,6 +15,7 @@ describe("Bifurcated critical strikes", function()
 		runCallback("OnFrame")
 
 		build.configTab.input.customMods = "+44% to critical hit chance\n"
+			.. (extraMods or "")
 			.. (bifurcate and "spell critical strike chance bifurcates\n" or "")
 			.. (lucky and "your critical strike chance is lucky\n" or "")
 			.. (extremeLuck and "your lucky or unlucky effects use the best or worst from three rolls instead of two\n" or "")
@@ -25,6 +26,13 @@ describe("Bifurcated critical strikes", function()
 		return build.calcsTab.mainOutput
 	end
 
+	it("uses quantised raw chance for each roll", function()
+		local luckyOutput = setupBifurcate("Spark 1/0  1", false, true, false, false,
+			"+0.01% to critical hit chance\n1% increased critical strike chance\n")
+		assert.are.equals(50.51, luckyOutput.PreEffectiveCritChance)
+		assert.are.near((1 - (1 - 0.5051) ^ 2) * 100, luckyOutput.CritChance, 10 ^ -9)
+	end)
+
 	it("calculates bifurcated critical hit damage", function()
 		local normalOutput = setupBifurcate("Spark 1/0  1")
 		assert.are.equals(50, normalOutput.CritChance)
diff --git a/src/Modules/CalcOffence.lua b/src/Modules/CalcOffence.lua
index 3fd3f028e3..883316a72d 100644
--- a/src/Modules/CalcOffence.lua
+++ b/src/Modules/CalcOffence.lua
@@ -3017,7 +3017,8 @@ function calcs.offence(env, actor, activeSkill)
 					inc = skillModList:Sum("INC", cfg, "CritChance") + (env.mode_effective and enemyDB:Sum("INC", nil, "SelfCritChance") or 0)
 					more = skillModList:More(cfg, "CritChance")
 				end
-				output.CritChance = (baseCrit + base) * (1 + inc / 100) * more
+				-- The game uses an integer permyriad chance for each critical strike roll.
+				output.CritChance = round((baseCrit + base) * (1 + inc / 100) * more * 100) / 100
 				local preCapCritChance = output.CritChance
 				output.CritChance = m_min(output.CritChance, skillModList:Override(nil, "CritChanceCap") or skillModList:Sum("BASE", cfg, "CritChanceCap"))
 				if (baseCrit + base) > 0 then