diff --git a/project/build.scala b/project/build.scala
index b03b338..1473c1d 100644
--- a/project/build.scala
+++ b/project/build.scala
@@ -45,6 +45,7 @@
         "org.eclipse.jetty.orbit" % "javax.servlet" % "3.0.0.v201112011016" % "container;provided;test" artifacts (Artifact("javax.servlet", "jar", "jar"))
       ),
       EclipseKeys.withSource := true,
+      javacOptions in compile ++= Seq("-target", "6", "-source", "6"),
       packageOptions += Package.MainClass("JettyLauncher")
     ) ++ seq(Twirl.settings: _*)
   )