diff --git a/nova/virt/firewall.py b/nova/virt/firewall.py
index 93a44131e8c6..355f70ab1d25 100644
--- a/nova/virt/firewall.py
+++ b/nova/virt/firewall.py
@@ -85,7 +85,7 @@ class FirewallDriver(object):
 
         Gets called when an instance gets added to or removed from
         the security group the instance is a member of or if the
-        group gains or looses a rule.
+        group gains or loses a rule.
         """
         raise NotImplementedError()