diff --git a/docs/schemas/storagecommon.rng b/docs/schemas/storagecommon.rng
index 9d17d934decb4c14270c6560e255a0c5420a85a0..63b51470a015cbd0f074286d3aa76c134960d02f 100644
--- a/docs/schemas/storagecommon.rng
+++ b/docs/schemas/storagecommon.rng
@@ -24,9 +24,7 @@
         </choice>
       </attribute>
       <interleave>
-        <zeroOrMore>
-          <ref name='secret'/>
-        </zeroOrMore>
+        <ref name='secret'/>
         <optional>
           <element name='cipher'>
             <ref name='keycipher'/>