diff --git a/lib/ex_aws/s3/parsers.ex b/lib/ex_aws/s3/parsers.ex
index bfa6e65..54ca874 100644
--- a/lib/ex_aws/s3/parsers.ex
+++ b/lib/ex_aws/s3/parsers.ex
@@ -105,6 +105,8 @@ if Code.ensure_loaded?(SweetXml) do
       {:ok, %{resp | body: parsed_body}}
     end
 
+    def parse_complete_multipart_upload(val), do: val
+
     def parse_list_multipart_uploads({:ok, %{body: xml} = resp}) do
       parsed_body =
         SweetXml.xpath(xml, ~x"//ListMultipartUploadsResult",
diff --git a/test/lib/s3/parser_test.exs b/test/lib/s3/parser_test.exs
index 5c519a8..692f8bb 100644
--- a/test/lib/s3/parser_test.exs
+++ b/test/lib/s3/parser_test.exs
@@ -334,28 +334,36 @@ defmodule ExAws.S3.ParserTest do
     end
   end
 
-  test "#parse_complete_multipart_upload parses CompleteMultipartUploadResult" do
-    complete_multipart_upload_response = """
-    <CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
-      <Location>https://s3-eu-west-1.amazonaws.com/my-bucket/tmp-copy3.mp4</Location>
-      <Bucket>my-bucket</Bucket>
-      <Key>tmp-copy3.mp4</Key>
-      <ETag>&quot;17fbc0a106abbb6f381aac6e331f2a19-1&quot;</ETag>
-    </CompleteMultipartUploadResult>
-    """
-
-    result =
-      ExAws.S3.Parsers.parse_complete_multipart_upload(
-        {:ok, %{body: complete_multipart_upload_response}}
-      )
+  describe "#parse_complete_multipart_upload" do
+    test "parses CompleteMultipartUploadResult" do
+      complete_multipart_upload_response = """
+      <CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
+        <Location>https://s3-eu-west-1.amazonaws.com/my-bucket/tmp-copy3.mp4</Location>
+        <Bucket>my-bucket</Bucket>
+        <Key>tmp-copy3.mp4</Key>
+        <ETag>&quot;17fbc0a106abbb6f381aac6e331f2a19-1&quot;</ETag>
+      </CompleteMultipartUploadResult>
+      """
 
-    {:ok, %{body: body}} = result
+      result =
+        ExAws.S3.Parsers.parse_complete_multipart_upload(
+          {:ok, %{body: complete_multipart_upload_response}}
+        )
+
+      {:ok, %{body: body}} = result
+
+      assert body == %{
+               location: "https://s3-eu-west-1.amazonaws.com/my-bucket/tmp-copy3.mp4",
+               bucket: "my-bucket",
+               key: "tmp-copy3.mp4",
+               etag: "\"17fbc0a106abbb6f381aac6e331f2a19-1\""
+             }
+    end
 
-    assert body == %{
-             location: "https://s3-eu-west-1.amazonaws.com/my-bucket/tmp-copy3.mp4",
-             bucket: "my-bucket",
-             key: "tmp-copy3.mp4",
-             etag: "\"17fbc0a106abbb6f381aac6e331f2a19-1\""
-           }
+    test "handles errors by passing them through" do
+      error = {:error, "error"}
+      result = ExAws.S3.Parsers.parse_complete_multipart_upload(error)
+      assert result == error
+    end
   end
 end