diff --git a/moto/s3/responses.py b/moto/s3/responses.py
index 6ba401b90..420b10ce7 100644
--- a/moto/s3/responses.py
+++ b/moto/s3/responses.py
@@ -237,7 +237,10 @@ class ResponseObject(_TemplateEnvironmentMixin):
         begin = 0
         end = None
         if 'range' in request.headers:
-            begin, end = map(int, request.headers.get('range').split('-'))
+            _, rspec = request.headers.get('range').split('=')
+            if ',' in rspec:
+                raise NotImplementedError("Multiple range specifiers not supported")
+            begin, end = map(lambda i: int(i) if i else None, rspec.split('-'))
 
         if isinstance(response, six.string_types):
             return 200, headers, response[begin:end]
diff --git a/tests/test_s3/test_s3.py b/tests/test_s3/test_s3.py
index ecfeb23c7..1b4077226 100644
--- a/tests/test_s3/test_s3.py
+++ b/tests/test_s3/test_s3.py
@@ -701,4 +701,6 @@ def test_ranged_get():
     key = Key(bucket)
     key.key = 'bigkey'
     key.set_contents_from_string('0' * 50 + '1' * 50)
-    key.get_contents_as_string(headers={'Range': '45-55'}).should.equal('0' * 5 + '1' * 5)
+    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' * 50 + b'1' * 5)