diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index d333c304a75a..b373bc38e131 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -265,6 +265,7 @@ device_sysctl_handler(SYSCTL_HANDLER_ARGS)
 	int error;
 
 	sbuf_new_for_sysctl(&sb, NULL, 1024, req);
+	sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
 	switch (arg2) {
 	case DEVICE_SYSCTL_DESC:
 		sbuf_cat(&sb, dev->desc ? dev->desc : "");