diff --git a/config.scm b/config.scm
index 1cde84c..8208011 100644
--- a/config.scm
+++ b/config.scm
@@ -287,7 +287,7 @@ SUBSYSTEM==\"usb_device\", GROUP=\"spice\", MODE=\"0660\"
                   (openvpn-remote-configuration
                     (name "vpn-rw.fdn.fr")
                     (port 53))))
-                (proto tcp)
+                (proto 'tcp)
                 (fast-io? #t)
                 (ca "/etc/openvpn/fdn.crt")
                 (auth-user-pass "/etc/openvpn/fdn.creds")))