diff --git a/src/storage/s3.js b/src/storage/s3.js
index 039f63eea..5e938e881 100644
--- a/src/storage/s3.js
+++ b/src/storage/s3.js
@@ -95,7 +95,10 @@ function upload(apiConfig, backupFilePath, sourceStream, callback) {
 
         // s3.upload automatically does a multi-part upload. we set queueSize to 1 to reduce memory usage
         // uploader will buffer at most queueSize * partSize bytes into memory at any given time.
-        s3.upload(params, { partSize: 10 * 1024 * 1024, queueSize: 1 }, function (error, data) {
+        // scaleway only supports 1000 parts per object (https://www.scaleway.com/en/docs/s3-multipart-upload/)
+        const partSize = apiConfig.provider === 'scaleway-objectstorage' ? 100 * 1024 * 1024 : 10 * 1024 * 1024;
+
+        s3.upload(params, { partSize, queueSize: 1 }, function (error, data) {
             if (error) {
                 debug('Error uploading [%s]: s3 upload error.', backupFilePath, error);
                 return callback(new BackupsError(BackupsError.EXTERNAL_ERROR, `Error uploading ${backupFilePath}. Message: ${error.message} HTTP Code: ${error.code}`));