diff --git a/include/libtorrent/torrent_handle.hpp b/include/libtorrent/torrent_handle.hpp
index a9fb94d73..c43cf475d 100644
--- a/include/libtorrent/torrent_handle.hpp
+++ b/include/libtorrent/torrent_handle.hpp
@@ -40,6 +40,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #pragma warning(push, 1)
 #endif
 
+#include <boost/assert.hpp>
 #include <boost/date_time/posix_time/posix_time_duration.hpp>
 
 #ifdef _MSC_VER