diff --git a/src/lib/Messages.svelte b/src/lib/Messages.svelte
index 63c4975..bdbb5d4 100644
--- a/src/lib/Messages.svelte
+++ b/src/lib/Messages.svelte
@@ -5,7 +5,7 @@
   import EditMessage from './EditMessage.svelte'
 
   export let messages : Message[]
-  export let chatId
+  export let chatId: number
   
   $: chat = $chatsStorage.find((chat) => chat.id === chatId) as Chat
   $: chatSettings = chat.settings
diff --git a/src/lib/Storage.svelte b/src/lib/Storage.svelte
index 0aeb33b..0918167 100644
--- a/src/lib/Storage.svelte
+++ b/src/lib/Storage.svelte
@@ -67,7 +67,7 @@
   }
 
   // Make sure a chat's settings are set with current values or defaults
-  export const updateChatSettings = (chatId) => {
+  export const updateChatSettings = (chatId:number) => {
     const chats = get(chatsStorage)
     const chat = chats.find((chat) => chat.id === chatId) as Chat
     if (!chat.settings) {