diff --git a/core/java/build.xml b/core/java/build.xml
index 86e0039ac2f1917f73c60c0d9dea2c04e9d2296c..27ca00e6fe6dcf785957d1de77ea8f236d94bdb7 100644
--- a/core/java/build.xml
+++ b/core/java/build.xml
@@ -49,6 +49,7 @@
         <cobertura-instrument todir="./build/obj_test">
             <fileset dir="./build/obj">
                 <include name="**/*.class"/>
+                <exclude name="**/*Test.class" />
             </fileset>
         </cobertura-instrument>
     </target>