diff --git a/include/libtorrent/alert_types.hpp b/include/libtorrent/alert_types.hpp
index 17dc08494..33bce2873 100644
--- a/include/libtorrent/alert_types.hpp
+++ b/include/libtorrent/alert_types.hpp
@@ -56,6 +56,9 @@ POSSIBILITY OF SUCH DAMAGE.
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
 
+// c++/cx keyword
+#undef interface
+
 namespace libtorrent
 {