diff --git a/modules/rhizo_base/manifests/init.pp b/modules/rhizo_base/manifests/init.pp
index 08f4dc1..068dea5 100644
--- a/modules/rhizo_base/manifests/init.pp
+++ b/modules/rhizo_base/manifests/init.pp
@@ -739,6 +739,12 @@ schedule { 'never':
       type   => 'ssh-rsa',
   }
 
+  if ($lsbdistcodename == 'stretch') {
+    $sysctl = '/sbin/sysctl'
+  } else {
+    $sysctl = '/usr/sbin/sysctl'
+  }
+
   if $has_ip6 == "1" {
     file { '/etc/network/ip6t-default':
           ensure  => 'present',
@@ -749,7 +755,7 @@ schedule { 'never':
           ensure => 'absent'
     }
     exec { 'ip6-activate':
-        command => '/usr/sbin/sysctl net.ipv6.conf.all.disable_ipv6=0'
+        command => "${sysctl} net.ipv6.conf.all.disable_ipv6=0"
     }
   } else {
     file { '/etc/sysctl.d/10-ipv6.conf':