diff --git a/apps/client/src/app/components/header/header.component.ts b/apps/client/src/app/components/header/header.component.ts
index f1e830e33..08efa6694 100644
--- a/apps/client/src/app/components/header/header.component.ts
+++ b/apps/client/src/app/components/header/header.component.ts
@@ -287,7 +287,7 @@ export class GfHeaderComponent implements OnChanges {
     this.assistantElement.initialize();
   }
 
-  public onSignOut() {
+  public onSignOut(): void {
     this.signOut.next();
   }