diff --git a/entrypoint.sh b/entrypoint.sh
index 948e8f1..ea1c7a2 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -64,8 +64,8 @@ unset rt
 
 # Change Apache port if needed from the default 80 to `WEBSERVER_PORT` (to run unprivileged or with a host network where no port mapping is available)
 if [[ -n "$WEBSERVER_PORT" ]]; then
-    sed -i "s/Listen 80/Listen \$WEBSERVER_PORT/" /etc/apache2/ports.conf
-    sed -i "s/VirtualHost *:80/VirtualHost *:\$WEBSERVER_PORT/" /etc/apache2/sites-enabled/000-default.conf
+    sed -i 's/Listen 80/Listen '"$WEBSERVER_PORT"'/' /etc/apache2/ports.conf
+    sed -i 's/VirtualHost *:80/VirtualHost *:'"$WEBSERVER_PORT"'/' /etc/apache2/sites-enabled/000-default.conf
 fi
 
 # Only restart if one of the enmod commands succeeded