diff --git a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
index f49860028..d64e36fb3 100644
--- a/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
+++ b/apps/client/src/app/pages/portfolio/activities/create-or-update-activity-dialog/create-or-update-activity-dialog.component.ts
@@ -91,7 +91,12 @@ export class CreateOrUpdateActivityDialog implements OnDestroy {
     });
 
     this.activityForm = this.formBuilder.group({
-      accountId: [this.data.activity?.accountId, Validators.required],
+      accountId: [
+        !!this.data.activity?.accountId || this.data.accounts.length !== 1
+          ? this.data.activity?.accountId
+          : this.data.accounts[0].id,
+        Validators.required
+      ],
       assetClass: [this.data.activity?.SymbolProfile?.assetClass],
       assetSubClass: [this.data.activity?.SymbolProfile?.assetSubClass],
       comment: [this.data.activity?.comment],