diff --git a/math/bonmin/Makefile b/math/bonmin/Makefile
index 487bbed37edc..44a1343318d0 100644
--- a/math/bonmin/Makefile
+++ b/math/bonmin/Makefile
@@ -15,7 +15,7 @@ LICENSE_FILE=	${WRKSRC}/Bonmin/LICENSE
 LIB_DEPENDS=	libCbc.so:math/coinmp \
 		libipopt.so:math/ipopt
 
-USES=		blaslapack:netlib gmake libtool pkgconfig
+USES=		blaslapack:netlib compiler:c++11-lang gmake libtool pkgconfig
 GNU_CONFIGURE=	yes
 USE_GITHUB=	yes
 GH_ACCOUNT=	coin-or
diff --git a/math/coinmp/Makefile b/math/coinmp/Makefile
index d27f1792f457..c5115104bf91 100644
--- a/math/coinmp/Makefile
+++ b/math/coinmp/Makefile
@@ -18,7 +18,7 @@ LICENSE_PERMS=	dist-mirror dist-sell pkg-mirror pkg-sell auto-accept
 CONFLICTS=	clp-[0-9]* ogdf-[0-9]*
 
 GNU_CONFIGURE=	yes
-USES=	libtool pathfix pkgconfig tar:tgz
+USES=	compiler:c++11-lang libtool pathfix pkgconfig tar:tgz
 USE_LDCONFIG=	yes
 CXXFLAGS+=	-ffast-math