diff --git a/lib/lib.sh b/lib/lib.sh
index efc8b42c..789bec0a 100644
--- a/lib/lib.sh
+++ b/lib/lib.sh
@@ -323,6 +323,16 @@ function get_host_port() {
     if test -z "$config"; then
         echo "$IP:3000"
     else
+        # Try to extract custom port from explicitly set ROOT_URL
+        local root_url="$(sed -ne 's/^ROOT_URL *= *\(.*\)/\1/p' < "$config")"
+        local port="${root_url##*:}"
+
+        if [[ ! -z "$port" ]]; then
+            echo "$IP:$port"
+            exit
+        fi
+
+        # Fall back to the set port
         echo "$IP:$(sed -n -e 's/^HTTP_PORT *= *\(.*\)/\1/p' <$config)"
     fi
 }