diff --git a/config.scm b/config.scm
index ebf50f3..7b3fe74 100644
--- a/config.scm
+++ b/config.scm
@@ -129,8 +129,8 @@
     (service screen-locker-service-type
              (screen-locker-configuration
               (name "swaylock")
-              
-              (file-append swaylock-effects "/bin/swaylock")
+              (program
+               (file-append swaylock-effects "/bin/swaylock"))
               (using-setuid? #f)))
     (service libvirt-service-type
              (libvirt-configuration