diff --git a/lib/emuctl/z80.bat b/lib/emuctl/z80.bat
index b195239..273d2a8 100644
--- a/lib/emuctl/z80.bat
+++ b/lib/emuctl/z80.bat
@@ -1,17 +1,17 @@
 rem Select z80 speed
 IFF 3 == %1
 	echo 'Select 3.51 Mhz'
-	omsxctl set speed 100
+	omsxctl set speed 100 > NUL
 	exit 0
 ENDIFF
 IFF 7 == %1
 	echo 'Select 7 Mhz'
-	omsxctl set speed 200
+	omsxctl set speed 200 > NUL
 	exit 0
 ENDIFF 
 IFF 11 == %1
 	echo 'Select 11 Mhz'
-	omsxctl set speed 333
+	omsxctl set speed 333 > NUL
 	exit 0
 ENDIFF
 echo 'Select openMSX Z80 emulation speed'