diff --git a/tensorboard/webapp/metrics/views/card_renderer/scalar_card_types.ts b/tensorboard/webapp/metrics/views/card_renderer/scalar_card_types.ts
index 7ac0ebeb43..7bb005ee63 100644
--- a/tensorboard/webapp/metrics/views/card_renderer/scalar_card_types.ts
+++ b/tensorboard/webapp/metrics/views/card_renderer/scalar_card_types.ts
@@ -100,8 +100,8 @@ export enum ColumnHeaderType {
 
 export interface ColumnHeader {
   type: ColumnHeaderType;
-  name: string;
-  displayName: string;
+  name?: string; // TODO(jameshollyer): make required after internal changes are made
+  displayName?: string; // TODO(jameshollyer): make required after internal changes are made
   enabled: boolean;
 }