diff --git a/build.xml b/build.xml
index 2f53b0b74..10e8cd9c9 100644
--- a/build.xml
+++ b/build.xml
@@ -105,7 +105,7 @@ INITIALISATION
       />
       <format
         property="short"
-        pattern="yyyyMMddHHmmss"
+        pattern="yyyyMMdd-HHmmss"
       />
     </tstamp>
     <!-- Testing if everything is in place -->