diff --git a/include/libtorrent/config.hpp b/include/libtorrent/config.hpp
index 3cf3798c1..c453ab35d 100644
--- a/include/libtorrent/config.hpp
+++ b/include/libtorrent/config.hpp
@@ -36,6 +36,8 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <boost/config.hpp>
 #include <boost/version.hpp>
 #include <stdio.h> // for snprintf
+#include <stdlib.h> // for _TRUNCATE (windows)
+#include <stdarg.h>
 
 #ifndef WIN32
 #define __STDC_FORMAT_MACROS