diff --git a/Shorewall-docs/support.xml b/Shorewall-docs/support.xml
index 2e9023312..636ff9461 100755
--- a/Shorewall-docs/support.xml
+++ b/Shorewall-docs/support.xml
@@ -31,7 +31,7 @@
     </legalnotice>
   </articleinfo>
 
-  <graphic fileref="images/obrasinf.gif" valign="middle" />
+  <graphic fileref="images/obrasinf.gif" format="GIF" valign="middle" />
 
   <section>
     <title>Before Reporting a Problem or Asking a Question</title>