diff --git a/ui/src/Tooltip.test.tsx b/ui/src/Tooltip.test.tsx
index 3da49d4e8f..e679863963 100644
--- a/ui/src/Tooltip.test.tsx
+++ b/ui/src/Tooltip.test.tsx
@@ -16,6 +16,8 @@ function getTestNode(): Entry {
             return 12345;
         }, toString(): string {
             return "test content";
+        }, getType(): EntryType {
+            return "unknown"
         }
     }
 }