diff --git a/src/freedombone b/src/freedombone
index 64d02d0e..4fd6bc5b 100755
--- a/src/freedombone
+++ b/src/freedombone
@@ -116,6 +116,9 @@ ONERNG_PACKAGE_DOWNLOAD="https://github.com/OneRNG/onerng.github.io/blob/master/
 # Hash for OneRNG driver
 ONERNG_PACKAGE_HASH='78f1c2f52ae573e3b398a695ece7ab9f41868252657ea269f0d5cf0bd4f2eb59'
 
+# device name for OneRNG
+ONERNG_DEVICE='ttyACM0'
+
 # Whether this system is being installed within a docker container
 INSTALLED_WITHIN_DOCKER="no"
 
@@ -4793,6 +4796,12 @@ function install_onerng {
   # install the package
   dpkg -i $ONERNG_PACKAGE
 
+  # check rng-tools configuration
+  if ! grep -q "/dev/$ONERNG_DEVICE" /etc/default/rng-tools; then
+      echo "HRNGDEVICE=/dev/$ONERNG_DEVICE" >> /etc/default/rng-tools
+      systemctl restart rng-tools
+  fi
+
   # Check that the install worked
   if [ ! -f /etc/onerng.conf ]; then
       echo 'OneRNG configuration file not found. The package may not have installed successfully.'
@@ -8819,7 +8828,7 @@ function create_upgrade_script {
   echo '    git pull' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   echo '    cp gpgit.pl /usr/bin' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   echo 'fi' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
-  
+
   echo 'exit 0' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   chmod +x /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   echo 'create_upgrade_script' >> $COMPLETION_FILE