diff --git a/tools/add-borguser.py b/tools/add-borguser.py
index e50f0bb..62e238f 100755
--- a/tools/add-borguser.py
+++ b/tools/add-borguser.py
@@ -54,7 +54,7 @@ class UserAdder(object):
         key_template = ('command='
                             #'"cd {homedir};'
                             #'borg serve --restrict-to-path {homedir}",'
-                            '"/usr/local/bin/borg-restricted.py ${SSH_ORIGINAL_COMMAND}",'
+                            '"/usr/local/bin/borg-restricted.py ${{SSH_ORIGINAL_COMMAND}}",'
                         'no-port-forwarding,'
                         'no-X11-forwarding,'
                         'no-pty,'