diff --git a/tests/test_security_null.cpp b/tests/test_security_null.cpp
index e95a7c9d..f0ce6b55 100644
--- a/tests/test_security_null.cpp
+++ b/tests/test_security_null.cpp
@@ -158,7 +158,11 @@ int main (void)
 
     ip4addr.sin_family = AF_INET;
     ip4addr.sin_port = htons(9003);
-    inet_pton(AF_INET, "127.0.0.1", &ip4addr.sin_addr);
+#if (ZMQ_HAVE_WINDOWS and _WIN32_WINNT < 0x0600)
+    ip4addr.sin_addr.s_addr = inet_addr ("127.0.0.1");
+#else
+     inet_pton(AF_INET, "127.0.0.1", &ip4addr.sin_addr);
+#endif
 
     s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
     rc = connect (s, (struct sockaddr*) &ip4addr, sizeof ip4addr);