diff --git a/packages/web/src/stores.ts b/packages/web/src/stores.ts
index 202f23989..b275d216d 100644
--- a/packages/web/src/stores.ts
+++ b/packages/web/src/stores.ts
@@ -20,6 +20,7 @@ export interface TabDefinition {
   tabComponent: string;
   tabOrder?: number;
   multiTabIndex?: number;
+  unsaved?: boolean;
 }
 
 export function writableWithStorage<T>(defaultValue: T, storageName) {
diff --git a/packages/web/src/tabpanel/TabRegister.svelte b/packages/web/src/tabpanel/TabRegister.svelte
index 4027e3bb3..7427c8680 100644
--- a/packages/web/src/tabpanel/TabRegister.svelte
+++ b/packages/web/src/tabpanel/TabRegister.svelte
@@ -50,6 +50,7 @@
     tabComponent={mountedTabs[tabid]}
     {...openedTabsByTabId[tabid]?.props}
     {tabid}
+    unsaved={openedTabsByTabId[tabid]?.unsaved}
     tabVisible={tabid == shownTab?.tabid}
   />
 {/each}