diff --git a/packages/redux-devtools-inspector-monitor/src/tabs/DiffTab.tsx b/packages/redux-devtools-inspector-monitor/src/tabs/DiffTab.tsx
index 34dded56..9667a695 100644
--- a/packages/redux-devtools-inspector-monitor/src/tabs/DiffTab.tsx
+++ b/packages/redux-devtools-inspector-monitor/src/tabs/DiffTab.tsx
@@ -35,7 +35,7 @@ DiffTab.propTypes = {
   invertTheme: PropTypes.bool.isRequired,
   labelRenderer: PropTypes.func.isRequired,
   isWideLayout: PropTypes.bool.isRequired,
-  dataTypeKey: PropTypes.string,
+  dataTypeKey: PropTypes.oneOfType([PropTypes.string, PropTypes.symbol]),
 };
 
 export default DiffTab;
diff --git a/packages/redux-devtools-inspector-monitor/src/tabs/StateTab.tsx b/packages/redux-devtools-inspector-monitor/src/tabs/StateTab.tsx
index 4e60d016..0522dfb9 100644
--- a/packages/redux-devtools-inspector-monitor/src/tabs/StateTab.tsx
+++ b/packages/redux-devtools-inspector-monitor/src/tabs/StateTab.tsx
@@ -35,7 +35,7 @@ StateTab.propTypes = {
   base16Theme: PropTypes.any.isRequired,
   invertTheme: PropTypes.bool.isRequired,
   labelRenderer: PropTypes.func.isRequired,
-  dataTypeKey: PropTypes.string,
+  dataTypeKey: PropTypes.oneOfType([PropTypes.string, PropTypes.symbol]),
   isWideLayout: PropTypes.bool.isRequired,
 };