diff --git a/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs b/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
index f4ce4b6e3a..247f72b3ec 100644
--- a/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
+++ b/BizHawk.Client.Common/lua/EmuLuaLibrary.Events.cs
@@ -228,7 +228,7 @@ namespace BizHawk.Client.Common
 			"unregisterbyid",
 			"Removes the registered function that matches the guid. If a function is found and remove the function will return true. If unable to find a match, the function will return false."
 		)]
-		public bool UnregisterById(object guid)
+		public bool UnregisterById(string guid)
 		{
 			foreach (var nlf in _luaFunctions.Where(nlf => nlf.Guid.ToString() == guid.ToString()))
 			{