diff --git a/main.lua b/main.lua
index 4ef5503..ac12eb5 100644
--- a/main.lua
+++ b/main.lua
@@ -41,6 +41,15 @@ ShaguTweaks:SetScript("OnEvent", function()
     return
   end
 
+  -- ShagaTweaks replaces ShaguTweaks: when the original is loaded as well, it
+  -- runs this session and is turned off from the next one. Its settings carry
+  -- over, as both addons save ShaguTweaks_config and ShaguTweaks_cache.
+  if IsAddOnLoaded("ShaguTweaks") then
+    DisableAddOn("ShaguTweaks")
+    DisableAddOn("ShaguTweaks-extras")
+    return
+  end
+
   -- load current expansion
   local expansion = ShaguTweaks:GetExpansion()