diff --git a/packages/frontend-core/src/components/grid/stores/ui.ts b/packages/frontend-core/src/components/grid/stores/ui.ts
index 33bf8d40aa..1ef9c42a32 100644
--- a/packages/frontend-core/src/components/grid/stores/ui.ts
+++ b/packages/frontend-core/src/components/grid/stores/ui.ts
@@ -11,7 +11,9 @@ import { Store as StoreContext } from "."
 
 export interface UIStore {
   focusedCellId: Writable<string | null>
-  focusedCellAPI: Writable<any>
+  focusedCellAPI: Writable<{
+    isReadonly: () => boolean
+  } | null>
   selectedRows: Writable<any>
   hoveredRowId: Writable<string | null>
   rowHeight: Writable<number>