diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index 20a14abef42..fdb92e30fd8 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -212,7 +212,7 @@ devclass_sysctl_handler(SYSCTL_HANDLER_ARGS)
 	default:
 		return (EINVAL);
 	}
-	return (SYSCTL_OUT(req, value, strlen(value)));
+	return (SYSCTL_OUT_STR(req, value));
 }
 
 static void
@@ -269,7 +269,7 @@ device_sysctl_handler(SYSCTL_HANDLER_ARGS)
 	default:
 		return (EINVAL);
 	}
-	error = SYSCTL_OUT(req, value, strlen(value));
+	error = SYSCTL_OUT_STR(req, value);
 	if (buf != NULL)
 		free(buf, M_BUS);
 	return (error);
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c
index 95f3250ee23..f662ec26807 100644
--- a/sys/kern/subr_param.c
+++ b/sys/kern/subr_param.c
@@ -300,6 +300,5 @@ init_param2(long physpages)
 static int
 sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
 {
-	return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 
-	    strlen(vm_guest_sysctl_names[vm_guest])));
+	return (SYSCTL_OUT_STR(req, vm_guest_sysctl_names[vm_guest]));
 }