diff --git a/docs/schemas/secret.rng b/docs/schemas/secret.rng
index 40e2b7ffa6..80270aef87 100644
--- a/docs/schemas/secret.rng
+++ b/docs/schemas/secret.rng
@@ -36,7 +36,7 @@
         <optional>
           <element name='usage'>
             <choice>
-              <ref name='usagevolume'>
+              <ref name='usagevolume'/>
               <!-- More choices later -->
             </choice>
           </element>