diff --git a/httpclient-cache/src/main/java/org/apache/http/impl/client/cache/IOUtils.java b/httpclient-cache/src/main/java/org/apache/http/impl/client/cache/IOUtils.java
index 44b66ef10..a9d78a216 100644
--- a/httpclient-cache/src/main/java/org/apache/http/impl/client/cache/IOUtils.java
+++ b/httpclient-cache/src/main/java/org/apache/http/impl/client/cache/IOUtils.java
@@ -69,7 +69,7 @@ class IOUtils {
 
     static void copyFile(final File in, final File out) throws IOException {
         RandomAccessFile f1 = new RandomAccessFile(in, "r");
-        RandomAccessFile f2 = new RandomAccessFile(out, "w");
+        RandomAccessFile f2 = new RandomAccessFile(out, "rw");
         try {
             FileChannel c1 = f1.getChannel();
             FileChannel c2 = f2.getChannel();