diff --git a/src/daemon/toks_daemon_ioctl.c b/src/daemon/toks_daemon_ioctl.c
index 373e525..221d3ed 100644
--- a/src/daemon/toks_daemon_ioctl.c
+++ b/src/daemon/toks_daemon_ioctl.c
@@ -26,7 +26,10 @@ static int32_t toks_daemon_ioctl_set_token_count(struct toks_daemon_ctx * dctx)
 	msg     = &dctx->reply;
 	ntokens = (int)(intptr_t)msg->ttyinfo.exarg;
 
-	if (ntokens > toks_get_driver_atokens(dctx->driver_ctx))
+	if (ntokens < 0)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	else if (ntokens > toks_get_driver_atokens(dctx->driver_ctx))
 		return NT_STATUS_BUFFER_TOO_SMALL;
 
 	toks_set_driver_ntokens(dctx->driver_ctx,ntokens);