diff --git a/dns/libidn2/Makefile b/dns/libidn2/Makefile
index feed6f71ec0f..9f3744a91db9 100644
--- a/dns/libidn2/Makefile
+++ b/dns/libidn2/Makefile
@@ -11,7 +11,8 @@ COMMENT=	Implementation of IDNA2008 internationalized domain names
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
-BUILD_DEPENDS=	help2man:misc/help2man
+BUILD_DEPENDS=	help2man:misc/help2man \
+		${LOCALBASE}/bin/grep:textproc/gnugrep
 LIB_DEPENDS=	libunistring.so:devel/libunistring
 
 USES=		charsetfix iconv libtool localbase makeinfo pathfix
@@ -22,6 +23,7 @@ CONFIGURE_ARGS=	--disable-nls \
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 USE_LDCONFIG=	yes
+MAKE_ARGS+=	GREP=${LOCALBASE}/bin/grep
 
 INFO=		libidn2