diff --git a/packages/publisher/s3/package.json b/packages/publisher/s3/package.json
index 08b04bd2ee..a55064afda 100644
--- a/packages/publisher/s3/package.json
+++ b/packages/publisher/s3/package.json
@@ -5,8 +5,7 @@
   "repository": "https://github.com/electron/forge",
   "author": "Samuel Attard",
   "license": "MIT",
-  "main": "dist/PublisherS3.js",
-  "typings": "dist/PublisherS3.d.ts",
+  "main": "dist/PublisherS3.ts",
   "devDependencies": {
     "chai": "^4.3.3",
     "mocha": "^9.0.1"
diff --git a/packages/publisher/s3/src/Config.ts b/packages/publisher/s3/src/Config.ts
index 52abd50a30..0428b67951 100644
--- a/packages/publisher/s3/src/Config.ts
+++ b/packages/publisher/s3/src/Config.ts
@@ -62,6 +62,13 @@ export interface PublisherS3Config {
    * Default: false
    */
   s3ForcePathStyle?: boolean;
+
+  /**
+   * Whether to calculate checksums for uploaded files (Fix for Cloudflare R2)
+   *
+   * Default: false
+   */
+  s3RequestChecksumCalculation?: 'WHEN_SUPPORTED' | 'WHEN_REQUIRED';
   /**
    * Custom function to provide the key to upload a given file to
    */
diff --git a/packages/publisher/s3/src/PublisherS3.ts b/packages/publisher/s3/src/PublisherS3.ts
index d5994538ad..9e9964abc7 100644
--- a/packages/publisher/s3/src/PublisherS3.ts
+++ b/packages/publisher/s3/src/PublisherS3.ts
@@ -48,6 +48,7 @@ export default class PublisherS3 extends PublisherStatic<PublisherS3Config> {
       region: this.config.region,
       endpoint: this.config.endpoint,
       forcePathStyle: !!this.config.s3ForcePathStyle,
+      requestChecksumCalculation: this.config.s3RequestChecksumCalculation,
     });
 
     d('creating s3 client with options:', this.config);