diff --git a/neutron/agent/linux/daemon.py b/neutron/agent/linux/daemon.py
index d9e4d83ab15..7f786e24158 100644
--- a/neutron/agent/linux/daemon.py
+++ b/neutron/agent/linux/daemon.py
@@ -131,8 +131,7 @@ class Pidfile(object):
         return self.pidfile
 
     def unlock(self):
-        if not not fcntl.flock(self.fd, fcntl.LOCK_UN):
-            raise IOError(_('Unable to unlock pid file'))
+        fcntl.flock(self.fd, fcntl.LOCK_UN)
 
     def write(self, pid):
         os.ftruncate(self.fd, 0)