diff --git a/packages/data-center/src/datacenter.ts b/packages/data-center/src/datacenter.ts
index e4fe394c7..8e70718c3 100644
--- a/packages/data-center/src/datacenter.ts
+++ b/packages/data-center/src/datacenter.ts
@@ -186,7 +186,7 @@ export class DataCenter {
    */
   public async onWorkspacesChange(
     callback: (workspaces: WorkspaceUnitCollectionChangeEvent) => void,
-    { immediate = true }: { immediate?: boolean }
+    { immediate = true }: { immediate?: boolean } = {}
   ) {
     if (immediate) {
       callback({