diff --git a/tools/vup.v b/tools/vup.v
index 8365c2082f..1cb53d1235 100644
--- a/tools/vup.v
+++ b/tools/vup.v
@@ -1,3 +1,5 @@
+module main
+
 import (
 	os
 	filepath
@@ -14,7 +16,7 @@ fn main() {
 		if os.exists( v_backup_file ) {
 			os.rm( v_backup_file )
 		}
-		os.mv_by_cp('$vroot/v.exe', v_backup_file) or { panic(err) }
+		os.mv('$vroot/v.exe', v_backup_file)
 		s2 := os.exec('"$vroot/make.bat"') or { panic(err) }
 		println(s2.output)
 	} $else {