Index: source/Commands/CommandObjectPlatform.cpp
===================================================================
--- source/Commands/CommandObjectPlatform.cpp
+++ source/Commands/CommandObjectPlatform.cpp
@@ -1235,7 +1235,7 @@
     DoExecute (Args& args, CommandReturnObject &result)
     {
         const char* src = args.GetArgumentAtIndex(0);
-        const char* dst = args.GetArgumentAtIndex(1);
+        const char* dst = args.GetArgumentAtIndex(args.GetArgumentCount() > 1 ? 1 : 0);
 
         FileSpec src_fs(src, true);
         FileSpec dst_fs(dst, false);