diff --git a/include/miniocpp/response.h b/include/miniocpp/response.h
index 436a4c2..93fcda9 100644
--- a/include/miniocpp/response.h
+++ b/include/miniocpp/response.h
@@ -153,6 +153,10 @@ struct CompleteMultipartUploadResponse : public Response {
   std::string location;
   std::string etag;
   std::string version_id;
+  std::string checksumCRC32;
+  std::string checksumCRC32C;
+  std::string checksumSHA1;
+  std::string checksumSHA256;
 
   CompleteMultipartUploadResponse() = default;
 
diff --git a/src/response.cc b/src/response.cc
index d1b724f..387c844 100644
--- a/src/response.cc
+++ b/src/response.cc
@@ -123,8 +123,7 @@ CompleteMultipartUploadResponse CompleteMultipartUploadResponse::ParseXML(
   if (!result) {
     return error::make<CompleteMultipartUploadResponse>("unable to parse XML");
   }
-  auto root = xdoc.select_node("/CompleteMultipartUploadOutput");
-
+  auto root = xdoc.select_node("/CompleteMultipartUploadResult");
   pugi::xpath_node text;
 
   text = root.node().select_node("Bucket/text()");
@@ -139,6 +138,18 @@ CompleteMultipartUploadResponse CompleteMultipartUploadResponse::ParseXML(
   text = root.node().select_node("ETag/text()");
   resp.etag = utils::Trim(text.node().value(), '"');
 
+  text = root.node().select_node("ChecksumCRC32/text()");
+  resp.checksumCRC32 = text.node().value();
+
+  text = root.node().select_node("ChecksumCRC32/text()");
+  resp.checksumCRC32C = text.node().value();
+
+  text = root.node().select_node("ChecksumSHA1/text()");
+  resp.checksumSHA1 = text.node().value();
+
+  text = root.node().select_node("ChecksumSHA256/text()");
+  resp.checksumSHA256 = text.node().value();
+
   resp.version_id = version_id;
 
   return resp;
diff --git a/tests/tests.cc b/tests/tests.cc
index e06e1b3..427dd62 100644
--- a/tests/tests.cc
+++ b/tests/tests.cc
@@ -461,9 +461,7 @@ class Tests {
       std::string object_name = RandObjectName();
       std::string data = "PutObject()";
       std::stringstream ss(data);
-      minio::s3::PutObjectArgs args(
-          ss, static_cast<long>(data.length()),
-          0);  // PWTODO: PutObjectArgs should accept size_t instead of long
+      minio::s3::PutObjectArgs args(ss, data.length(), 0);
       args.bucket = bucket_name_;
       args.object = object_name;
       minio::s3::PutObjectResponse resp = client_.PutObject(args);
@@ -475,9 +473,9 @@ class Tests {
 
     {
       std::string object_name = RandObjectName();
-      size_t size = 13930573;
+      size_t size = 67108865;  // (64MiB + 1) bytes
       RandCharStream stream(size);
-      minio::s3::PutObjectArgs args(stream, static_cast<long>(size), 0);
+      minio::s3::PutObjectArgs args(stream, size, 0);
       args.bucket = bucket_name_;
       args.object = object_name;
       minio::s3::PutObjectResponse resp = client_.PutObject(args);
@@ -485,6 +483,9 @@ class Tests {
         throw std::runtime_error("<Multipart> PutObject(): " +
                                  resp.Error().String());
       }
+      if (resp.etag == "") {
+        throw std::runtime_error("<Multipart> PutObject(): etag is missing");
+      }
       RemoveObject(bucket_name_, object_name);
     }
   }