diff --git a/src/vim9script.c b/src/vim9script.c
index 2e94b8e..e7bb433 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -67,9 +67,10 @@
     if (in_vim9script())
 	switch (eap->cmdidx)
 	{
-	    case CMD_insert:
 	    case CMD_append:
 	    case CMD_change:
+	    case CMD_insert:
+	    case CMD_t:
 	    case CMD_xit:
 		semsg(_("E1100: Missing :let: %s"), eap->cmd);
 		return FAIL;