diff --git a/config.sh b/config.sh
index 0aab2c7..94ce181 100644
--- a/config.sh
+++ b/config.sh
@@ -603,12 +603,8 @@ Defaults:vagrant !requiretty
 EOF
   chmod 0440 /etc/sudoers.d/vagrant
   # This may have to be changed for 10
-  ex -s /etc/ssh/sshd_config <<EOF
-:%substitute/^\(PasswordAuthentication\) yes$/\1 no/
-:%substitute/^#\(UseDNS\) yes$/&\r\1 no/
-:update
-:quit
-EOF
+  sed -i 's/^\(PasswordAuthentication\) yes$/\1 no/' /etc/ssh/sshd_config
+  sed -i 's/^#\(UseDNS\) yes$/\r\1 no/' /etc/ssh/sshd_config
 
   cat >>/etc/sysconfig/sshd <<EOF
 # Decrease connection time by preventing reverse DNS lookups