diff --git a/core/include/sched.h b/core/include/sched.h
index 253fb2c053..f99f9a79cd 100644
--- a/core/include/sched.h
+++ b/core/include/sched.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2014 Freie Universität Berlin
  *
- * This file subject to the terms and conditions of the GNU Lesser General
+ * This file is subject to the terms and conditions of the GNU Lesser General
  * Public License. See the file LICENSE in the top level directory for more
  * details.
  */