diff --git a/artifactory.py b/artifactory.py
index 72d50a5..4258297 100755
--- a/artifactory.py
+++ b/artifactory.py
@@ -2104,7 +2104,7 @@ def open(self, mode="r", buffering=-1, encoding=None, errors=None, newline=None)
         HTTPResponse, as if it was a regular filesystem object.
         The only difference is that this object doesn't support seek()
         """
-        if mode != "r" or buffering != -1 or encoding or errors or newline:
+        if mode not in {"r", "rb"} or buffering != -1 or encoding or errors or newline:
             raise NotImplementedError("Only the default open() arguments are supported")
 
         return self._accessor.open(self)