diff --git a/math/ann/Makefile b/math/ann/Makefile
index 30b453d0ecc5..dd49b5850272 100644
--- a/math/ann/Makefile
+++ b/math/ann/Makefile
@@ -9,8 +9,9 @@ MAINTAINER=	tzhuan@csie.org
 COMMENT=	Library for Approximate Nearest Neighbor Searching
 WWW=		https://www.cs.umd.edu/~mount/ANN/
 
-USE_LDCONFIG=	yes
 USES=		gmake
+USE_CXXSTD=	c++14
+USE_LDCONFIG=	yes
 
 post-install:
 	${INSTALL_LIB} ${WRKSRC}/lib/libann.so.0 ${STAGEDIR}${PREFIX}/lib