diff --git a/moto/s3/models.py b/moto/s3/models.py
index 431c9c988..30ecf1595 100644
--- a/moto/s3/models.py
+++ b/moto/s3/models.py
@@ -175,11 +175,14 @@ class FakeMultipart(BaseModel):
         count = 0
         for pn, etag in body:
             part = self.parts.get(pn)
-            if part is None or part.etag != etag:
+            part_etag = None
+            if part is not None:
+                part_etag = part.etag.replace('"', '')
+                etag = etag.replace('"', '')
+            if part is None or part_etag != etag:
                 raise InvalidPart()
             if last is not None and len(last.value) < UPLOAD_PART_MIN_SIZE:
                 raise EntityTooSmall()
-            part_etag = part.etag.replace('"', '')
             md5s.extend(decode_hex(part_etag)[0])
             total.extend(part.value)
             last = part
diff --git a/tests/test_s3/test_s3.py b/tests/test_s3/test_s3.py
index 9f37791cb..6de79f874 100644
--- a/tests/test_s3/test_s3.py
+++ b/tests/test_s3/test_s3.py
@@ -225,6 +225,29 @@ def test_multipart_invalid_order():
     bucket.complete_multipart_upload.when.called_with(
         multipart.key_name, multipart.id, xml).should.throw(S3ResponseError)
 
+@mock_s3_deprecated
+@reduced_min_part_size
+def test_multipart_etag_quotes_stripped():
+    # Create Bucket so that test can run
+    conn = boto.connect_s3('the_key', 'the_secret')
+    bucket = conn.create_bucket('mybucket')
+
+    multipart = bucket.initiate_multipart_upload("the-key")
+    part1 = b'0' * REDUCED_PART_SIZE
+    etag1 = multipart.upload_part_from_file(BytesIO(part1), 1).etag
+    # last part, can be less than 5 MB
+    part2 = b'1'
+    etag2 = multipart.upload_part_from_file(BytesIO(part2), 2).etag
+    # Strip quotes from etags
+    etag1 = etag1.replace('"','')
+    etag2 = etag2.replace('"','')
+    xml = "<Part><PartNumber>{0}</PartNumber><ETag>{1}</ETag></Part>"
+    xml = xml.format(1, etag1) + xml.format(2, etag2)
+    xml = "<CompleteMultipartUpload>{0}</CompleteMultipartUpload>".format(xml)
+    bucket.complete_multipart_upload.when.called_with(
+        multipart.key_name, multipart.id, xml).should_not.throw(S3ResponseError)
+    # we should get both parts as the key contents
+    bucket.get_key("the-key").etag.should.equal(EXPECTED_ETAG)
 
 @mock_s3_deprecated
 @reduced_min_part_size