diff --git a/.changeset/nervous-stingrays-travel.md b/.changeset/nervous-stingrays-travel.md
new file mode 100644
index 000000000000..9ccc3e6c650a
--- /dev/null
+++ b/.changeset/nervous-stingrays-travel.md
@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+Warn when an invalid `<select multiple>` value is given