diff --git a/doc/manual/nix-copy-closure.xml b/doc/manual/nix-copy-closure.xml
index 29383d1243..45cfc0f342 100644
--- a/doc/manual/nix-copy-closure.xml
+++ b/doc/manual/nix-copy-closure.xml
@@ -28,7 +28,7 @@
     <arg><option>--xz</option></arg>
     <arg><option>--include-outputs</option></arg>
     <arg choice='plain'>
-      <arg><replaceable>user@</replaceable></arg><replaceable>machine</replaceable>
+      <replaceable>user@</replaceable><replaceable>machine</replaceable>
     </arg>
     <arg choice='plain'><replaceable>paths</replaceable></arg>
   </cmdsynopsis>