diff --git a/packages/data/src/types.ts b/packages/data/src/types.ts
index cec806fd7d7c3..fe7d9061d3c5d 100644
--- a/packages/data/src/types.ts
+++ b/packages/data/src/types.ts
@@ -143,7 +143,7 @@ type CurriedState< F > = F extends SelectorWithCustomCurrySignature
  * ```
  */
 export interface SelectorWithCustomCurrySignature {
-	CurriedSignature?: Function;
+	CurriedSignature: Function;
 }
 
 export interface DataRegistry {