diff --git a/puppetserver/docker-entrypoint.d/50-set-certname.sh b/puppetserver/docker-entrypoint.d/50-set-certname.sh
index 054fe1a9..440e11e5 100755
--- a/puppetserver/docker-entrypoint.d/50-set-certname.sh
+++ b/puppetserver/docker-entrypoint.d/50-set-certname.sh
@@ -3,9 +3,9 @@
 set -e
 
 if [ -n "${PUPPETSERVER_HOSTNAME}" ]; then
-  puppet config set server "$PUPPETSERVER_HOSTNAME"
+  /usr/bin/puppet config set server "$PUPPETSERVER_HOSTNAME"
 fi
 
 if [ -n "${CERTNAME}" ]; then
-  puppet config set certname "$CERTNAME"
+  /usr/bin/puppet config set certname "$CERTNAME"
 fi