diff --git a/doc/guix-cookbook.texi b/doc/guix-cookbook.texi
index 4c2b23786c..e41d584813 100644
--- a/doc/guix-cookbook.texi
+++ b/doc/guix-cookbook.texi
@@ -2453,7 +2453,7 @@ be made setuid-root so it can authenticate users, and it needs a PAM service. Th
 can be achieved by adding the following service to your @file{config.scm}:
 
 @lisp
-(service screen-locker-services-type
+(service screen-locker-service-type
          (screen-locker-configuration
           (name "slock")
           (program (file-append slock "/bin/slock"))))