diff --git a/check.xml b/check.xml
index 83e16a5ad..52f3fb3b4 100644
--- a/check.xml
+++ b/check.xml
@@ -91,7 +91,7 @@
 
   <!-- Simian -->
   <property name="simian.version"
-            value="2.4.0"
+            value="2.5.8"
             description="Which Version of Simian to use"/>
   <property name="simian.uri"
             value="http://www.harukizaemon.com/simian/simian-${simian.version}.tar.gz"
@@ -202,7 +202,17 @@
     <mkdir dir="${simian.report.dir}"/>
     <simian failureProperty="simian.duplicates.found">
         <fileset dir="${java.dir}" />
+        <!--
+        Having both formatters defined results in a 
+            java.lang.UnsupportedOperationException
+                at java.util.AbstractList.add(Unknown Source)
+                at java.util.AbstractList.add(Unknown Source)
+                at com.harukizaemon.simian.CompositeAuditListener.add(Unknown Source)
+                at com.harukizaemon.simian.SimianTask.A(Unknown Source)
+                at com.harukizaemon.simian.SimianTask.B(Unknown Source)
+                at com.harukizaemon.simian.SimianTask.execute(Unknown Source)
         <formatter type="plain" toFile="${simian.report.dir}/simian-log.txt"/>
+        -->
         <formatter type="xml" toFile="${simian.report.dir}/simian-log.xml"/>
     </simian>
     <xslt in="${simian.report.dir}/simian-log.xml" style="${simian.lib.dir}/simian.xsl" out="${simian.report.dir}/simian.html"/>