diff --git a/OSBindings/Mac/Clock Signal/Documents/Atari2600Document.swift b/OSBindings/Mac/Clock Signal/Documents/Atari2600Document.swift
index bf58f176f..835597711 100644
--- a/OSBindings/Mac/Clock Signal/Documents/Atari2600Document.swift	
+++ b/OSBindings/Mac/Clock Signal/Documents/Atari2600Document.swift	
@@ -31,7 +31,7 @@ class Atari2600Document: MachineDocument {
 		return "Atari2600Document"
 	}
 
-	private var atari2600: CSAtari2600! = nil
+	private var atari2600 = CSAtari2600()
 	override func dataOfType(typeName: String) throws -> NSData {
 		// Insert code here to write your document to data of the specified type. If outError != nil, ensure that you create and set an appropriate error when returning nil.
 		// You can also choose to override fileWrapperOfType:error:, writeToURL:ofType:error:, or writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.
@@ -39,7 +39,6 @@ class Atari2600Document: MachineDocument {
 	}
 
 	override func readFromData(data: NSData, ofType typeName: String) throws {
-		atari2600 = CSAtari2600()
 		atari2600.setROM(data)
 	}