diff --git a/viewer/svutil.cpp b/viewer/svutil.cpp
index 34a2286..bc2a7e1 100644
--- a/viewer/svutil.cpp
+++ b/viewer/svutil.cpp
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #ifdef _WIN32
 #include <windows.h>
+#pragma comment(lib, "Ws2_32.lib")
 struct addrinfo {
   struct sockaddr* ai_addr;
   int ai_addrlen;