diff --git a/python/ovs/socket_util.py b/python/ovs/socket_util.py
index 8d34b7163..1af6474b0 100644
--- a/python/ovs/socket_util.py
+++ b/python/ovs/socket_util.py
@@ -302,11 +302,11 @@ def set_dscp(sock, dscp):
     try:
         sock.setsockopt(socket.IPPROTO_IP, socket.IP_TOS, val)
     except socket.error, e:
-        if e.errno != errno.ENOPROTOOPT:
+        if get_exception_errno(e) != errno.ENOPROTOOPT:
             raise
     success = True
     try:
         sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_TCLASS, val)
     except socket.error, e:
-        if e.errno != errno.ENOPROTOOPT or not success:
+        if get_exception_errno(e) != errno.ENOPROTOOPT or not success:
             raise