diff --git a/autobahn/util.py b/autobahn/util.py
index c3d3f4786..a66b26f28 100644
--- a/autobahn/util.py
+++ b/autobahn/util.py
@@ -279,7 +279,7 @@ def __next__(self):
 
 
 # 8 byte mask with 53 LSBs set (WAMP requires IDs from [1, 2**53]
-_WAMP_ID_MASK = struct.unpack("@Q", b"\x00\x1f\xff\xff\xff\xff\xff\xff")[0]
+_WAMP_ID_MASK = struct.unpack(">Q", b"\x00\x1f\xff\xff\xff\xff\xff\xff")[0]
 
 
 def rid():
@@ -298,7 +298,7 @@ def rid():
     :returns: A random integer ID.
     :rtype: int
     """
-    return struct.unpack("@Q", os.urandom(8))[0] & _WAMP_ID_MASK or 2 ** 53
+    return struct.unpack(">Q", os.urandom(8))[0] & _WAMP_ID_MASK or 2 ** 53
 
 
 # noinspection PyShadowingBuiltins