diff --git a/misc/mdp/Makefile b/misc/mdp/Makefile
index c0232bb3799d..73e4482c022e 100644
--- a/misc/mdp/Makefile
+++ b/misc/mdp/Makefile
@@ -1,23 +1,26 @@
 # $FreeBSD$
 
 PORTNAME=	mdp
 PORTVERSION=	0.93.0
 CATEGORIES=	misc
 
 MAINTAINER=	neel@neelc.org
 COMMENT=	Command-line based markdown presentation tool
 
 LICENSE=	GPLv3
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	visit1985
 GH_COMMIT=	c905942
 
 USES=		gmake
 WRKSRC=		${WRKDIR}/${GH_ACCOUNT}-${GH_PROJECT}-${GH_COMMIT}
 PLIST_FILES=	bin/${PORTNAME}
 
+OPTIONS_DEFINE=		DEBUG
+DEBUG_MAKE_ARGS+=	DEBUG=1
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/mdp ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.mk>