diff --git a/openbis/build/build.xml b/openbis/build/build.xml
index e57c1b56a3ae32b4e0b1151e0d624048adf29ae0..29f30ae0887f50480a7ae1e7c3af1f2f452bbf43 100644
--- a/openbis/build/build.xml
+++ b/openbis/build/build.xml
@@ -473,6 +473,9 @@
       <fileset dir="${lib}/jython">
         <include name="jython.jar" />
       </fileset>
+      <fileset dir="${lib}/jsonrpc4j">
+        <include name="jsonrpc4j.jar" />
+      </fileset>
     </copy>
   	<antcall target="prepare-gwt.copy-common-source" />
   </target>