diff --git a/.changeset/silent-colts-flow.md b/.changeset/silent-colts-flow.md
new file mode 100644
index 00000000000..f4408828cf7
--- /dev/null
+++ b/.changeset/silent-colts-flow.md
@@ -0,0 +1,5 @@
+---
+"@smithy/experimental-identity-and-auth": patch
+---
+
+Await `signer.sign()` in `httpSigningMiddleware`
diff --git a/packages/experimental-identity-and-auth/src/middleware-http-signing/httpSigningMiddleware.ts b/packages/experimental-identity-and-auth/src/middleware-http-signing/httpSigningMiddleware.ts
index 9d2acdbc52d..1181b132ce3 100644
--- a/packages/experimental-identity-and-auth/src/middleware-http-signing/httpSigningMiddleware.ts
+++ b/packages/experimental-identity-and-auth/src/middleware-http-signing/httpSigningMiddleware.ts
@@ -52,6 +52,6 @@ export const httpSigningMiddleware = <Input extends object, Output extends objec
   } = scheme;
   return next({
     ...args,
-    request: signer.sign(args.request, identity, signingProperties || {}),
+    request: await signer.sign(args.request, identity, signingProperties || {}),
   });
 };