diff --git a/tests/flow_expire.py b/tests/flow_expire.py
index 70ab10e..0467e4b 100644
--- a/tests/flow_expire.py
+++ b/tests/flow_expire.py
@@ -55,7 +55,7 @@
         
         match.in_port = ingress_port
         
-        request = ofp.message.flow_mod()
+        request = ofp.message.flow_add()
         request.match = match
         request.cookie = random.randint(0,9007199254740992)
         request.buffer_id = 0xffffffff