diff --git a/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift b/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift
index 158786bfb..f779a6bbc 100644
--- a/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift	
+++ b/OSBindings/Mac/Clock Signal/Documents/MachineDocument.swift	
@@ -364,6 +364,8 @@ class MachineDocument:
 	}
 
 	@IBAction func cancelCreateMachine(_ sender: NSButton?) {
+		self.windowControllers[0].window?.endSheet(self.machinePickerPanel!)
+		self.machinePicker = nil
 		close()
 	}