diff --git a/sysutils/zfs-snapshot-clean/Makefile b/sysutils/zfs-snapshot-clean/Makefile
index d43daa4f2d3e..af592223ed15 100644
--- a/sysutils/zfs-snapshot-clean/Makefile
+++ b/sysutils/zfs-snapshot-clean/Makefile
@@ -10,14 +10,17 @@ PORTVERSION=	0.1.2
 CATEGORIES=	sysutils
 MASTER_SITES=	http://download.github.com/ \
 		ftp://ftp.iDaemons.org/pub/distfiles/
-DISTNAME=	knu-${PORTNAME}-v${PORTVERSION}-0-g10b2b34
+DISTNAME=	knu-${PORTNAME}-v${PORTVERSION}-0-g${FILEHASH}
 
 MAINTAINER=	knu@FreeBSD.org
 COMMENT=	A tool to sieve ZFS snapshots as per given spec a la 'pdumpfs-clean'
 
 NO_BUILD=	yes
+WRKSRC=		${WRKDIR}/knu-${PORTNAME}-${FILEHASH}
 PLIST_FILES=	sbin/${PORTNAME}
 
+FILEHASH=	10b2b34
+
 do-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/${PORTNAME} ${PREFIX}/sbin/