diff --git a/src/mx2cc/mx2cc.monkey2 b/src/mx2cc/mx2cc.monkey2
index e2db67f2c..52f79bfc1 100644
--- a/src/mx2cc/mx2cc.monkey2
+++ b/src/mx2cc/mx2cc.monkey2
@@ -470,7 +470,8 @@ Function ParseOpts:String[]( opts:BuildOpts,args:String[] )
 				Fail( "Invalid value for 'verbose' option: '"+val+"' - must be '0', '1', '2', '3' or '-1'" )
 			End
 		Default
-			Fail( "Invalid option: '"+opt+"'" )
+			If opt.StartsWith( "-" ) Fail( "Invalid option: '"+opt+"'" )
+			Exit
 		End
 	
 	Next