diff --git a/server/startup/migrations/v16.coffee b/server/startup/migrations/v16.coffee
new file mode 100644
index 00000000000..2315bd2057f
--- /dev/null
+++ b/server/startup/migrations/v16.coffee
@@ -0,0 +1,6 @@
+Meteor.startup ->
+	Migrations.add
+		version: 16
+		up: ->
+			rawMessage = ChatMessage.rawCollection()
+			Meteor.wrapAsync(rawMessage.dropIndex, rawMessage)({ _hidden: 1 })