diff --git a/waterbutler/core/streams/http.py b/waterbutler/core/streams/http.py
index 552016d78..dcb8811e9 100644
--- a/waterbutler/core/streams/http.py
+++ b/waterbutler/core/streams/http.py
@@ -140,12 +140,10 @@ def _make_boundary_stream(self):
 
 class ResponseStreamReader(BaseStream):
 
-    def __init__(self, response, size=None, name=None, unsizable=False):
+    def __init__(self, response, size=None, name=None):
         super().__init__()
         if 'Content-Length' in response.headers:
             self._size = int(response.headers['Content-Length'])
-        elif not unsizable:
-            self._size = int(size)
         else:
             self._size = None