diff --git a/docs/schemas/interface.rng b/docs/schemas/interface.rng
index a0df9bacc7aa5f6984082017f3482a0181ba2f06..75893b537aa377dfbb9633aa87a67664e88bb56b 100644
--- a/docs/schemas/interface.rng
+++ b/docs/schemas/interface.rng
@@ -439,7 +439,7 @@
 
   <define name='ipv4-addr'>
     <data type='string'>
-      <param name="pattern">(((25[0-5])|(1[0-9]{2})|(2[0-4][0-9])|([0-9]{1,2}))\.){3}((25[0-5])|(1[0-9]{2})|(2[0-4][0-9])|([0-9]{1,2}))</param>
+      <param name="pattern">(((25[0-5])|(2[0-4][0-9])|(1[0-9]{2})|([1-9][0-9])|([0-9]))\.){3}((25[0-5])|(2[0-4][0-9])|(1[0-9]{2})|([1-9][0-9])|([0-9]))</param>
     </data>
   </define>