diff --git a/upgrade.sh b/upgrade.sh
index 029483b5..66748216 100755
--- a/upgrade.sh
+++ b/upgrade.sh
@@ -34,6 +34,12 @@ if [ ! -d /opt/wrolpi ] || [ ! -d /opt/wrolpi/wrolpi ]; then
   exit 2
 fi
 
+# Re-execute this script if it wasn't called with sudo.
+if [ $EUID != 0 ]; then
+  sudo "$0" "$@"
+  exit $?
+fi
+
 set -x
 set -e