diff --git a/test/test_ip4_irb.py b/test/test_ip4_irb.py
index bbec7ca..460cb43 100644
--- a/test/test_ip4_irb.py
+++ b/test/test_ip4_irb.py
@@ -54,7 +54,7 @@
 
         # create 3 pg interfaces, 1 loopback interface
         cls.create_pg_interfaces(range(3))
-        cls.create_loopback_interfaces(range(1))
+        cls.create_loopback_interfaces(1)
 
         cls.interfaces = list(cls.pg_interfaces)
         cls.interfaces.extend(cls.lo_interfaces)