diff --git a/build.xml b/build.xml
index 9f56d4f..65fbe0a 100644
--- a/build.xml
+++ b/build.xml
@@ -203,7 +203,8 @@
              classpath="${classpath}"
              debug="false"
              deprecation="true"
-             optimize="true"/>
+             optimize="true"
+             target="1.4"/>
    </target>
 
    <target name="build-test" depends="init,build-java" if="available-src-test">
@@ -213,7 +214,8 @@
              classpath="${classpath}"
              debug="false"
              deprecation="true"
-             optimize="true"/>
+             optimize="true"
+             target="1.4"/>
    </target>
 
    <!-- ######################################################### -->