diff --git a/math/wfmath/Makefile b/math/wfmath/Makefile
index f5ec3ddc8966..31ec520aaa6e 100644
--- a/math/wfmath/Makefile
+++ b/math/wfmath/Makefile
@@ -12,4 +12,6 @@ USES=		libtool pathfix pkgconfig compiler:c++11-lib
 USE_LDCONFIG=	yes
 GNU_CONFIGURE=	yes
 
+CXXFLAGS+=	-Dregister=
+
 .include <bsd.port.mk>