diff --git a/misc/cbc_attach/cbc_attach.service b/misc/cbc_attach/cbc_attach.service
index 946ddd1cb..5fb126e9d 100644
--- a/misc/cbc_attach/cbc_attach.service
+++ b/misc/cbc_attach/cbc_attach.service
@@ -5,7 +5,7 @@ After=sysinit.target local.target
 Before=basic.target
 
 [Service]
-ExecStart=/usr/bin/cbc_attach -f /dev/ttyS2
+ExecStart=/usr/bin/cbc_attach /dev/ttyS2
 Restart=always
 Type=notify