diff --git a/CHANGES.txt b/CHANGES.txt
index dae0792..78710e0 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -118,6 +118,9 @@
     MAPREDUCE-2379. Adds missing DistributedCache configurations in 
     mapred-default.xml (Todd Lipcon via amareshwari)
 
+    MAPREDUCE-2348. Disable mumak tests on trunk since they currently time out
+    (todd)
+
 Release 0.22.0 - Unreleased
 
   INCOMPATIBLE CHANGES
diff --git a/src/contrib/build.xml b/src/contrib/build.xml
index 5026c53..ddae8b9 100644
--- a/src/contrib/build.xml
+++ b/src/contrib/build.xml
@@ -66,7 +66,8 @@
       <fileset dir="." includes="dynamic-scheduler/build.xml"/>
       <fileset dir="." includes="gridmix/build.xml"/>
       <fileset dir="." includes="vertica/build.xml"/>
-      <fileset dir="." includes="mumak/build.xml"/>
+      <!-- mumak tests disabled due to timeouts. See MAPREDUCE-2348
+      <fileset dir="." includes="mumak/build.xml"/> -->
       <fileset dir="." includes="raid/build.xml"/>
     </subant>
     <available file="${build.contrib.dir}/testsfailed" property="testsfailed"/>