diff --git a/moto/s3/responses.py b/moto/s3/responses.py
index <HASH>..<HASH> 100644
--- a/moto/s3/responses.py
+++ b/moto/s3/responses.py
@@ -245,6 +245,8 @@ class ResponseObject(_TemplateEnvironmentMixin):
             return 400, headers, ""
         if begin < 0 or end > length or begin > min(end, length):
             return 416, headers, ""
+        headers['content-range'] = "bytes {0}-{1}/{2}".format(
+            begin, end, length)
         return 206, headers, response_content[begin:end]
 
     def key_response(self, request, full_url, headers):
diff --git a/tests/test_s3/test_s3.py b/tests/test_s3/test_s3.py
index <HASH>..<HASH> 100644
--- a/tests/test_s3/test_s3.py
+++ b/tests/test_s3/test_s3.py
@@ -704,3 +704,4 @@ def test_ranged_get():
     key.get_contents_as_string(headers={'Range': 'bytes=45-55'}).should.equal(b'0' * 5 + b'1' * 5)
     key.get_contents_as_string(headers={'Range': 'bytes=45-'}).should.equal(b'0' * 5 + b'1' * 50)
     key.get_contents_as_string(headers={'Range': 'bytes=-55'}).should.equal(b'0' * 5 + b'1' * 50)
+    key.size.should.equal(100)
set content-range header so boto knows this is a ranged response