diff --git a/Mac/scripts/fullbuild.py b/Mac/scripts/fullbuild.py
index 3337512de32c..050028697259 100644
--- a/Mac/scripts/fullbuild.py
+++ b/Mac/scripts/fullbuild.py
@@ -273,7 +273,7 @@ def handle_dialog(filename):
 	(":Mac:Build:icglue.carbon.mcp", "icglue.carbon"),
 	(":Mac:Build:waste.carbon.mcp", "waste.carbon"),
 	(":Mac:Build:zlib.carbon.mcp", "zlib.carbon"),
-##	(":Mac:Build:_tkinter.mcp", "_tkinter.carbon"),
+	(":Mac:Build:_dummy_tkinter.mcp", "_tkinter.carbon"),
 ##	(":Extensions:Imaging:_tkinter.carbon.mcp", "_tkinter.carbon"),
 	(":Mac:Build:ColorPicker.carbon.mcp", "ColorPicker.carbon"),
 	(":Mac:Build:App.carbon.mcp", "App.carbon"),