Index: src/main/org/apache/tools/ant/helper/ProjectHelper2.java
===================================================================
--- src/main/org/apache/tools/ant/helper/ProjectHelper2.java	(revision 1436599)
+++ src/main/org/apache/tools/ant/helper/ProjectHelper2.java	(working copy)
@@ -48,6 +48,7 @@
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
 import java.net.URL;
+import java.net.URLConnection;
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.Map;
@@ -257,7 +258,9 @@
                     inputStream =
                         zf.getInputStream(zf.getEntry(uri.substring(pling + 1)));
                 } else {
-                    inputStream = url.openStream();
+                    URLConnection urlConnection = url.openConnection();
+                    urlConnection.setUseCaches(false);
+                    inputStream = urlConnection.getInputStream();
                 }
             }