diff --git a/ms/do_win64a.bat b/ms/do_win64a.bat
index ff8b19ccfd20c54d60c4c28c19420e14cd10ab01..8768dc61be20529dbb1d4f629974c51a7121f98e 100755
--- a/ms/do_win64a.bat
+++ b/ms/do_win64a.bat
@@ -1,6 +1,6 @@
 perl util\mkfiles.pl >MINFO
 
-cmd /c "nasm -f win64 -v" >NUL: 2>&1
+cmd /c "nasm -f win64 -v" >NUL 2>&1
 if %errorlevel% neq 0 goto ml64
 
 perl ms\uplink-x86_64.pl nasm > ms\uptable.asm