diff --git a/build.xml b/build.xml
index 4778110f165..f26346a7a19 100644
--- a/build.xml
+++ b/build.xml
@@ -35,15 +35,20 @@
 
   <target name="lucene-jars-to-solr">
     <!-- temp hack - copy lucene jars to solr -->
-    <copy todir="solr/lib" file="lucene/build/lucene-core-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/analyzers/common/lucene-analyzers-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/fast-vector-highlighter/lucene-fast-vector-highlighter-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/highlighter/lucene-highlighter-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/memory/lucene-memory-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/misc/lucene-misc-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/queries/lucene-queries-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/spatial/lucene-spatial-${lucene.version}.jar" />
-    <copy todir="solr/lib" file="lucene/build/contrib/spellchecker/lucene-spellchecker-${lucene.version}.jar" />
+
+    <copy todir="solr/lib" preservelastmodified="true" flatten="true" overwrite="true">
+      <resources>
+        <file file="lucene/build/lucene-core-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/analyzers/common/lucene-analyzers-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/fast-vector-highlighter/lucene-fast-vector-highlighter-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/highlighter/lucene-highlighter-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/memory/lucene-memory-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/misc/lucene-misc-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/queries/lucene-queries-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/spatial/lucene-spatial-${lucene.version}.jar" />
+        <file file="lucene/build/contrib/spellchecker/lucene-spellchecker-${lucene.version}.jar" />
+      </resources>
+    </copy>
   </target>
 
   <target name="clean">