diff --git a/schemas/v1/14_vm_messages_uniq_params.go b/schemas/v1/14_vm_messages_uniq_params.go
new file mode 100644
index 000000000..1a4eb82d9
--- /dev/null
+++ b/schemas/v1/14_vm_messages_uniq_params.go
@@ -0,0 +1,11 @@
+package v1
+
+func init() {
+	patches.Register(
+		14,
+		`
+ALTER TABLE {{ .SchemaName | default "public"}}.vm_messages
+  ADD CONSTRAINT vm_messages_uniq_params UNIQUE (height, state_root, cid, source, params);
+`,
+	)
+}