diff --git a/moto/s3/models.py b/moto/s3/models.py
index cdd96015e..1cf183d56 100644
--- a/moto/s3/models.py
+++ b/moto/s3/models.py
@@ -91,7 +91,7 @@ class FakeKey(BaseModel):
     @property
     def response_dict(self):
         res = {
-            'Etag': self.etag,
+            'ETag': self.etag,
             'last-modified': self.last_modified_RFC1123,
             'content-length': str(len(self.value)),
         }
diff --git a/tests/test_s3/test_server.py b/tests/test_s3/test_server.py
index f6b8f889c..44a085bea 100644
--- a/tests/test_s3/test_server.py
+++ b/tests/test_s3/test_server.py
@@ -34,6 +34,7 @@ def test_s3_server_bucket_create():
     res = test_client.put(
         '/bar', 'http://foobaz.localhost:5000/', data='test value')
     res.status_code.should.equal(200)
+    assert 'ETag' in dict(res.headers)
 
     res = test_client.get('/bar', 'http://foobaz.localhost:5000/')
     res.status_code.should.equal(200)