diff --git a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
index 49918dc91472..3cefccfdd910 100644
--- a/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
+++ b/packages/middleware-flexible-checksums/src/flexibleChecksumsMiddleware.ts
@@ -81,7 +81,7 @@ export const flexibleChecksumsMiddleware =
     const { requestValidationModeMember, responseAlgorithms } = middlewareConfig;
     // @ts-ignore Element implicitly has an 'any' type for input[requestValidationModeMember]
     if (requestValidationModeMember && input[requestValidationModeMember] === "ENABLED") {
-      validateChecksumFromResponse(result.response as HttpResponse, {
+      await validateChecksumFromResponse(result.response as HttpResponse, {
         config,
         responseAlgorithms,
       });