diff --git a/launcher-implementation/src/main/scala/xsbt/boot/Launch.scala b/launcher-implementation/src/main/scala/xsbt/boot/Launch.scala
index 0ff537c..018513a 100644
--- a/launcher-implementation/src/main/scala/xsbt/boot/Launch.scala
+++ b/launcher-implementation/src/main/scala/xsbt/boot/Launch.scala
@@ -493,7 +493,8 @@ class Launch private[xsbt] (
         entryPoint.asSubclass(AppMainClass)
       def newMain(): xsbti.AppMain = {
         if (ServerApplication.isServerApplication(entryPoint)) ServerApplication(this)
-        else if (AppMainClass.isAssignableFrom(entryPoint)) mainClass.newInstance
+        else if (AppMainClass.isAssignableFrom(entryPoint))
+          mainClass.getDeclaredConstructor().newInstance()
         else if (PlainApplication.isPlainApplication(entryPoint)) PlainApplication(entryPoint)
         else
           throw new IncompatibleClassChangeError(
diff --git a/launcher-implementation/src/main/scala/xsbt/boot/ServerApplication.scala b/launcher-implementation/src/main/scala/xsbt/boot/ServerApplication.scala
index ba3753b..a1a71d3 100644
--- a/launcher-implementation/src/main/scala/xsbt/boot/ServerApplication.scala
+++ b/launcher-implementation/src/main/scala/xsbt/boot/ServerApplication.scala
@@ -12,7 +12,8 @@ class ServerApplication private (provider: xsbti.AppProvider) extends xsbti.AppM
   import ServerApplication._
 
   override def run(configuration: xsbti.AppConfiguration): xsbti.MainResult = {
-    val serverMain = provider.entryPoint.asSubclass(ServerMainClass).newInstance
+    val serverMain =
+      provider.entryPoint.asSubclass(ServerMainClass).getDeclaredConstructor().newInstance()
     val server = serverMain.start(configuration)
     Console.err.println(s"${SERVER_SYNCH_TEXT}${server.uri}")
     server.awaitTermination()