build-jar: lb-client-java.jar
 
 lb-client-java.jar:
-       cd build && ${jdk_prefix}/bin/jar cf lb-client-java.jar holders org
+       cd build && ${jdk_prefix}/bin/jar cfi lb-client-java.jar holders org
 
 build-c:
        ${JAVAH} -classpath build -jni -d build org.glite.lb.ContextIL
        cp ${FULL_EXAMPLES} build/examples/src
        cp ${SSL_EXAMPLES} build/examples/src/simple-ssl
        cp ${TM_EXAMPLES} build/examples/src/simple-trustmanager
-       cd build/examples && ${jdk_prefix}/bin/jar cf lb-client-java-examples.jar src org $(addsuffix .class,$(basename $(notdir ${FULL_EXAMPLES})))
+       cd build/examples && ${jdk_prefix}/bin/jar cfi lb-client-java-examples.jar src org $(addsuffix .class,$(basename $(notdir ${FULL_EXAMPLES})))
 
 genevents: build/gen