diff -r e77095ade618 -r 65deccd64f3a src/hotspot/share/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp
--- a/src/hotspot/share/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp	Thu Feb 14 15:12:17 2019 -0800
+++ b/src/hotspot/share/jfr/recorder/checkpoint/types/jfrThreadGroup.cpp	Thu Feb 14 15:17:03 2019 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -238,9 +238,8 @@
   assert(_thread_group_name == NULL, "invariant");
   if (tgname != NULL) {
     size_t len = strlen(tgname);
-    _thread_group_name = JfrCHeapObj::new_array<char>(len+1);
-    strncpy(_thread_group_name, tgname, len);
-    _thread_group_name[len] = '\0';
+    _thread_group_name = JfrCHeapObj::new_array<char>(len + 1);
+    strncpy(_thread_group_name, tgname, len + 1);
   }
 }