diff --git a/src/internal/sqs.ts b/src/internal/sqs.ts
index 34c2f03..332eaea 100644
--- a/src/internal/sqs.ts
+++ b/src/internal/sqs.ts
@@ -67,7 +67,7 @@ export class SQSClient extends AWSClient {
         const signedRequest: SignedHTTPRequest = this.signature.sign(
             {
                 method: 'POST',
-                protocol: 'https',
+                protocol: this.scheme,
                 hostname: this.host,
                 path: '/',
                 headers: {
@@ -130,7 +130,7 @@ export class SQSClient extends AWSClient {
         const signedRequest: SignedHTTPRequest = this.signature.sign(
             {
                 method: 'POST',
-                protocol: 'https',
+                protocol: this.scheme,
                 hostname: this.host,
                 path: '/',
                 headers: {
@@ -254,4 +254,4 @@ export interface ListQueuesResponse {
      * Pagination token to include in the next request.
      */
     nextToken?: string
-}
\ No newline at end of file
+}