diff --git a/.luacheckrc b/.luacheckrc
index 661771c..1f30fd2 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -78,7 +78,6 @@ read_globals = {
 	"GetSpellInfo",
 	"HasExtraActionBar",
 	"InCombatLockdown",
-	"IsAddOnLoaded",
 	"IsKeyRingEnabled",
 	"IsModifiedClick",
 	"IsPetAttackAction",
diff --git a/HideBlizzardClassic.lua b/HideBlizzardClassic.lua
index b5e9f0c..65d6042 100644
--- a/HideBlizzardClassic.lua
+++ b/HideBlizzardClassic.lua
@@ -137,7 +137,7 @@ function Bartender4:HideBlizzard()
 	hideActionBarFrame(ReputationWatchBar, false, false, true)
 	hideActionBarFrame(MainMenuBarMaxLevelBar, false, false, true)
 
-	if IsAddOnLoaded("Blizzard_NewPlayerExperience") then
+	if C_AddOns.IsAddOnLoaded("Blizzard_NewPlayerExperience") then
 		self:NPE_LoadUI()
 	elseif NPE_LoadUI ~= nil then
 		self:SecureHook("NPE_LoadUI")