diff --git a/devel/ruby-subversion/Makefile b/devel/ruby-subversion/Makefile
index e6d323019d4d..4398eec5bdc1 100644
--- a/devel/ruby-subversion/Makefile
+++ b/devel/ruby-subversion/Makefile
@@ -1,27 +1,29 @@
 # Created by: Hiroyuki Iwatsuki <don@na.rim.or.jp>
 
 PKGNAMEPREFIX=	ruby-
 
 MAINTAINER=	lev@FreeBSD.org
 COMMENT=	Ruby bindings for version control system
 
 USES+=		compiler:c11
 USE_RUBY=	yes
 
 PORTREVISION_114=	0
 PORTREVISION_LTS=	0
 
 SVN_BUILD_BINDINGS=	yes
 
 .include "${.CURDIR}/../../devel/subversion/Makefile.addons"
 
 CATEGORIES+=	ruby
 
 CONFIGURE_ARGS+=	--without-gnome-keyring \
 			--without-kwallet \
 			--with-apxs=no
 
 ALL_TARGET=	swig-rb-lib swig-rb
 INSTALL_TARGET=	install-swig-rb
 
+CFLAGS+=	-fdeclspec
+
 .include <bsd.port.post.mk>