diff --git a/Makefile.inc1 b/Makefile.inc1
index e5fc3936a261..585697d38931 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -718,6 +718,7 @@ _INSTALL_DDIR=	${DESTDIR}/${DISTDIR}
 INSTALL_DDIR=	${_INSTALL_DDIR:S://:/:g:C:/$::}
 .if defined(NO_ROOT)
 METALOG?=	${DESTDIR}/${DISTDIR}/METALOG
+METALOG:=	${METALOG:C,//+,/,g}
 IMAKE+=		-DNO_ROOT METALOG=${METALOG}
 INSTALLFLAGS+=	-U -M ${METALOG} -D ${INSTALL_DDIR}
 MTREEFLAGS+=	-W