diff --git a/test/t_route.rb b/test/t_route.rb
index acab915..cc48948 100644
--- a/test/t_route.rb
+++ b/test/t_route.rb
@@ -42,6 +42,7 @@ class TestAddr < Test::Unit::TestCase
 
     test "massively parallel IP address addition" do
       @ifname = create_test_interface
+      return if @ifname.nil?
 
       ips = (10..20).map {|y| (1..254).map {|z| "10.100.#{y}.#{z}" } }.flatten.compact
 
@@ -55,7 +56,7 @@ class TestAddr < Test::Unit::TestCase
         }
       }
 
-      threads.map(&:join)
+      threads.map{|t| t.join }
       created = @ip.addr.list(:index => @ifname, :family => Socket::AF_INET).
         map {|ifaddr| ifaddr.address.to_s }