diff --git a/Rakefile b/Rakefile
index ab8e6e5d8..f9fccc7cb 100644
--- a/Rakefile
+++ b/Rakefile
@@ -74,9 +74,11 @@ if ENV["TRAVIS"]
 
   desc "Run vmunit tests on clean stone and again after update.sh ran"
   task :"travis:vmunit" do
-    system "rake tests:vmunit"
-    system "./update.sh"
-    system "rake tests:vmunit"
+    unless system("rake tests:vmunit") &&
+        system("./update.sh") &&
+        system("rake tests:vmunit")
+      exit 1
+    end
   end
 end
 
diff --git a/src/test/github338.rb b/src/test/github338.rb
index 94104d434..821dbea14 100644
--- a/src/test/github338.rb
+++ b/src/test/github338.rb
@@ -1,6 +1,6 @@
 require 'socket'
 
-server = TCPServer.new 2000 # Server bind to port 2000
+server = TCPServer.new "127.0.0.1", 2000 # Server bind to port 2000
 output = []
 
 def read_socket_message(socket, chunk_size = 2)