diff --git a/viewer/svutil.cpp b/viewer/svutil.cpp
index c50d11de4..131d9f388 100644
--- a/viewer/svutil.cpp
+++ b/viewer/svutil.cpp
@@ -50,6 +50,8 @@ struct addrinfo {
 #endif
 #endif
 
+#include <cstdlib>
+#include <cstring>
 #include <iostream>
 #include <string>