diff --git a/CHANGES.txt b/CHANGES.txt
index 0a1d40615a..3ce9f9edad 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -34,6 +34,7 @@
  * Avoid digest mismatch with empty but static rows (CASSANDRA-12090)
  * Fix EOF exception when altering column type (CASSANDRA-11820)
 Merged from 2.2:
+ * Add Sigar to classes included in clientutil.jar (CASSANDRA-11635)
  * Add decay to histograms and timers used for metrics (CASSANDRA-11752)
  * Fix hanging stream session (CASSANDRA-10992)
  * Fix INSERT JSON, fromJson() support of smallint, tinyint types (CASSANDRA-12371)
diff --git a/build.xml b/build.xml
index 083013b0e8..02e868710d 100644
--- a/build.xml
+++ b/build.xml
@@ -867,6 +867,7 @@
           <include name="org/apache/cassandra/exceptions/*.class" />
           <include name="org/apache/cassandra/utils/CloseableIterator.class" />
           <include name="org/apache/cassandra/io/util/*.class" />
+          <include name="org/apache/cassandra/utils/SigarLibrary.class" />
         </fileset>
         <manifest>
           <attribute name="Implementation-Title" value="Cassandra"/>
@@ -1204,6 +1205,8 @@
   -->
   <target name="test-clientutil-jar" depends="build-test,jar" description="Test clientutil jar">
     <junit fork="on" forkmode="perTest" failureproperty="testfailed" maxmemory="1024m" timeout="${test.timeout}">
+      <!-- Note that the test pass without that next line, but it prints an ugly error message -->
+      <jvmarg value="-Djava.library.path=${build.lib}/sigar-bin"/>
       <test name="org.apache.cassandra.serializers.ClientUtilsTest" />
       <formatter type="brief" usefile="false" />
       <classpath>
@@ -1217,6 +1220,7 @@
         <pathelement location="${build.lib}/logback-classic-1.1.3.jar" />
         <pathelement location="${build.lib}/jackson-core-asl-1.9.2.jar" />
         <pathelement location="${build.lib}/jackson-mapper-asl-1.9.2.jar" />
+        <pathelement location="${build.lib}/sigar-1.6.4.jar" />
         <fileset dir="${build.dir.lib}">
           <include name="**/junit*.jar" />
         </fileset>