diff --git a/src/find-options/operator/Raw.ts b/src/find-options/operator/Raw.ts
index cb0c163eb9..7c1f4c5d0c 100644
--- a/src/find-options/operator/Raw.ts
+++ b/src/find-options/operator/Raw.ts
@@ -4,6 +4,6 @@ import {FindOperator} from "../FindOperator";
  * Find Options Operator.
  * Example: { someField: Raw([...]) }
  */
-export function Raw<T>(value: string|((columnAlias?: string) => string)) {
+export function Raw<T>(value: string|((columnAlias: string) => string)) {
     return new FindOperator("raw", value as any, false);
 }
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