diff --git a/packages/redux-devtools-inspector-monitor-test-tab/demo/src/DemoApp.tsx b/packages/redux-devtools-inspector-monitor-test-tab/demo/src/DemoApp.tsx
index be42557f..24c261f9 100644
--- a/packages/redux-devtools-inspector-monitor-test-tab/demo/src/DemoApp.tsx
+++ b/packages/redux-devtools-inspector-monitor-test-tab/demo/src/DemoApp.tsx
@@ -70,7 +70,7 @@ interface Props
 }
 
 function DemoApp(props: Props) {
-  const timeout = useRef<number | undefined>();
+  const timeout = useRef<number | undefined>(undefined);
   const location = useLocation();
 
   const options = getOptions(location);
diff --git a/packages/redux-devtools-inspector-monitor/demo/src/DemoApp.tsx b/packages/redux-devtools-inspector-monitor/demo/src/DemoApp.tsx
index 90fd7d29..255cc4e4 100644
--- a/packages/redux-devtools-inspector-monitor/demo/src/DemoApp.tsx
+++ b/packages/redux-devtools-inspector-monitor/demo/src/DemoApp.tsx
@@ -142,7 +142,7 @@ interface Props
 }
 
 function DemoApp(props: Props) {
-  const timeout = useRef<number | undefined>();
+  const timeout = useRef<number | undefined>(undefined);
   const location = useLocation();
   const navigate = useNavigate();