diff --git a/doc/builders/images/dockertools.section.md b/doc/builders/images/dockertools.section.md
index 458b0b36720..d7f8741437c 100644
--- a/doc/builders/images/dockertools.section.md
+++ b/doc/builders/images/dockertools.section.md
@@ -302,7 +302,7 @@ buildImage {
 
   runAsRoot = ''
     #!${pkgs.runtimeShell}
-    ${shadowSetup}
+    ${pkgs.dockerTools.shadowSetup}
     groupadd -r redis
     useradd -r -g redis redis
     mkdir /data