diff --git a/include/libtorrent/bitfield.hpp b/include/libtorrent/bitfield.hpp
index 25c7252db..7685b40e2 100644
--- a/include/libtorrent/bitfield.hpp
+++ b/include/libtorrent/bitfield.hpp
@@ -35,6 +35,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "libtorrent/assert.hpp"
 #include "libtorrent/config.hpp"
+#include <cstring> // for memset and memcpy
 
 namespace libtorrent
 {