diff --git a/boto3/data/resources/s3-2006-03-01.resources.json b/boto3/data/resources/s3-2006-03-01.resources.json
index 508a9a9d87..684caa2b3a 100644
--- a/boto3/data/resources/s3-2006-03-01.resources.json
+++ b/boto3/data/resources/s3-2006-03-01.resources.json
@@ -698,8 +698,8 @@
             "type": "MultipartUploadPart",
             "identifiers": [
               { "target": "BucketName", "source": "identifier", "name": "BucketName" },
-              { "target": "MultipartUploadId", "source": "identifier", "name": "Id" },
               { "target": "ObjectKey", "source": "identifier", "name": "ObjectKey" },
+              { "target": "MultipartUploadId", "source": "identifier", "name": "Id" },
               { "target": "PartNumber", "source": "input" }
             ]
           }
@@ -770,8 +770,8 @@
             "type": "MultipartUpload",
             "identifiers": [
               { "target": "BucketName", "source": "identifier", "name": "BucketName" },
-              { "target": "Id", "source": "identifier", "name": "MultipartUploadId" },
-              { "target": "ObjectKey", "source": "identifier", "name": "ObjectKey" }
+              { "target": "ObjectKey", "source": "identifier", "name": "ObjectKey" },
+              { "target": "Id", "source": "identifier", "name": "MultipartUploadId" }
             ]
           }
         }
diff --git a/tests/integration/test_s3.py b/tests/integration/test_s3.py
index affb800c29..ef4ac3b057 100644
--- a/tests/integration/test_s3.py
+++ b/tests/integration/test_s3.py
@@ -92,3 +92,32 @@ def test_can_create_object_directly(self):
 
         self.assertEqual(obj.bucket_name, self.bucket_name)
         self.assertEqual(obj.key, 'test.txt')
+
+    def test_s3_multipart(self):
+        # Create the bucket
+        bucket = self.create_bucket_resource(self.bucket_name)
+        bucket.wait_until_exists()
+
+        # Create the multipart upload
+        mpu = bucket.Object('mp-test.txt').initiate_multipart_upload()
+        self.addCleanup(mpu.abort)
+
+        # Create and upload a part
+        part = mpu.Part(1)
+        response = part.upload(Body='hello, world!')
+
+        # Complete the upload, which requires info on all of the parts
+        part_info = {
+            'Parts': [
+                {
+                    'PartNumber': 1,
+                    'ETag': response['ETag']
+                }
+            ]
+        }
+
+        mpu.complete(MultipartUpload=part_info)
+        self.addCleanup(bucket.Object('mp-test.txt').delete)
+
+        contents = bucket.Object('mp-test.txt').get()['Body'].read()
+        self.assertEqual(contents, b'hello, world!')