diff --git a/chapter07/kernfs.xml b/chapter07/kernfs.xml
index ecdff0dd2..31244e8c0 100644
--- a/chapter07/kernfs.xml
+++ b/chapter07/kernfs.xml
@@ -100,7 +100,7 @@ mount -vt tmpfs tmpfs $LFS/run</userinput></screen>
       symbolic link to a directory, typically
       <filename class="directory">/run/shm</filename>.
       The /run tmpfs was mounted above so in this case only a
-      directory needs to be created.</para>
+      directory needs to be created with a correct mode.</para>
 
       <para>In other host systems <filename>/dev/shm</filename> is a mount point 
       for a tmpfs. In that case the mount of /dev above will only create
@@ -108,7 +108,7 @@ mount -vt tmpfs tmpfs $LFS/run</userinput></screen>
       we must explicitly mount a tmpfs:</para>
 
 <screen><userinput>if [ -h $LFS/dev/shm ]; then
-  mkdir -pv $LFS$(realpath /dev/shm)
+  install -v -d -m 1777 $LFS$(realpath /dev/shm)
 else
   mount -vt tmpfs -o nosuid,nodev tmpfs $LFS/dev/shm
 fi</userinput></screen>
diff --git a/chapter11/afterlfs.xml b/chapter11/afterlfs.xml
index 5c2693ade..633a782df 100644
--- a/chapter11/afterlfs.xml
+++ b/chapter11/afterlfs.xml
@@ -130,7 +130,7 @@ mounttype proc    proc   proc
 mounttype sys     sysfs  sysfs
 mounttype run     tmpfs  run
 if [ -h $LFS/dev/shm ]; then
-  mkdir -pv $LFS$(realpath /dev/shm)
+  install -v -d -m 1777 $LFS$(realpath /dev/shm)
 else
   mounttype dev/shm tmpfs tmpfs -o nosuid,nodev
 fi