diff --git a/build.sbt b/build.sbt
index 6cc5d2e..e79eaf6 100644
--- a/build.sbt
+++ b/build.sbt
@@ -186,9 +186,7 @@
   manifest.getMainAttributes put (AttrName.MANIFEST_VERSION, "1.0")
   manifest.getMainAttributes put (AttrName.MAIN_CLASS, "JettyLauncher")
   val outputFile = workDir / warName
-  IO jar (contentMappings.map { case (file, path) => (file, path.toString) }, outputFile, manifest, Some(
-    System.currentTimeMillis()
-  ))
+  IO jar (contentMappings.map { case (file, path) => (file, path.toString) }, outputFile, manifest)
 
   // generate checksums
   Seq(