diff --git a/boot-strap b/boot-strap
index 28d8bf7..6e3aa6c 100644
--- a/boot-strap
+++ a/boot-strap
@@ -391,7 +391,7 @@
 	    cd $Mydir &&
 	    MAKESYSPATH=$mksrc SRCTOP=$Mydir OBJTOP=$objdir \
 	    MAKEOBJDIR='${.CURDIR:S,${SRCTOP:tA},${OBJTOP:tA},}' \
-	    ${BMAKE:-$objdir/bmake} -f $Mydir/Makefile "$@"
+	    ${BMAKE:-$objdir/bmake} -B -f $Mydir/Makefile "$@"
     )
 }

