diff --git a/packages/iris-grid/src/IrisGridTableModelTemplate.ts b/packages/iris-grid/src/IrisGridTableModelTemplate.ts
index 804cc0979e..c99df74c9e 100644
--- a/packages/iris-grid/src/IrisGridTableModelTemplate.ts
+++ b/packages/iris-grid/src/IrisGridTableModelTemplate.ts
@@ -2025,7 +2025,7 @@ class IrisGridTableModelTemplate<
     }
   }
 
-  editValueForCell(x: ModelIndex, y: ModelIndex): string | null {
+  editValueForCell(x: ModelIndex, y: ModelIndex): string | null | undefined {
     return this.textValueForCell(x, y);
   }