diff --git a/main/src/test/scala/sbt/internal/GCMonitorTest.scala b/main/src/test/scala/sbt/internal/GCMonitorTest.scala
index 7bc6b5978..067ea15c1 100644
--- a/main/src/test/scala/sbt/internal/GCMonitorTest.scala
+++ b/main/src/test/scala/sbt/internal/GCMonitorTest.scala
@@ -1,3 +1,10 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
 package sbt.internal
 
 import java.util.concurrent.atomic.AtomicReference
diff --git a/main/src/test/scala/sbt/internal/StressGCMonitor.scala b/main/src/test/scala/sbt/internal/StressGCMonitor.scala
index c8f9cbf82..d9593ef79 100644
--- a/main/src/test/scala/sbt/internal/StressGCMonitor.scala
+++ b/main/src/test/scala/sbt/internal/StressGCMonitor.scala
@@ -1,3 +1,10 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
 package sbt.internal
 
 import sbt.internal.util.ConsoleLogger