diff --git a/bindings/java/build-unix.xml b/bindings/java/build-unix.xml
index b9c0872f02981181a44f0fc3c8103afc8ce36104..d35e7404d4bc0b90717afabcf760e37a0cc01f2f 100644
--- a/bindings/java/build-unix.xml
+++ b/bindings/java/build-unix.xml
@@ -54,7 +54,7 @@
 		<property name="jni.dylib" location="${basedir}/jni/.libs/libtsk_jni.dylib" />
 		<property name="jni.jnilib" value="libtsk_jni.jnilib" />
 		<!-- x86_64 -->
-        <copy file="${jni.dylib}" tofile="${x86_64}/mac/${jni.jnilib}"/>
+        <copy file="${jni.dylib}" tofile="${x86_64}/mac/${jni.jnilib}" overwrite="true"/>
 		<!-- amd64 -->
 		<copy file="${jni.dylib}" tofile="${amd64}/mac/${jni.jnilib}" overwrite="true"/>
     </target>