diff --git a/test/hotspot/jtreg/vmTestbase/nsk/share/native/native_thread.cpp b/test/hotspot/jtreg/vmTestbase/nsk/share/native/native_thread.cpp
index 089aab78bb5..1929864e0d0 100644
--- a/test/hotspot/jtreg/vmTestbase/nsk/share/native/native_thread.cpp
+++ b/test/hotspot/jtreg/vmTestbase/nsk/share/native/native_thread.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2025, 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
@@ -98,7 +98,11 @@ void* procedure(void* t) {
     thread->started  = 1;
     thread->status   = thread->procedure(thread->context);
     thread->finished = 1;
+#ifdef windows
     return 0;
+#else // !windows
+    return nullptr;
+#endif
 }
 
 /**
diff --git a/test/hotspot/jtreg/vmTestbase/nsk/share/native/nsk_list.cpp b/test/hotspot/jtreg/vmTestbase/nsk/share/native/nsk_list.cpp
index 736ddafdfaf..3da3858445b 100644
--- a/test/hotspot/jtreg/vmTestbase/nsk/share/native/nsk_list.cpp
+++ b/test/hotspot/jtreg/vmTestbase/nsk/share/native/nsk_list.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2004, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2004, 2025, 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
@@ -109,7 +109,7 @@ int nsk_list_remove(const void *plist, int ind) {
             list_info->arr[i - 1] = list_info->arr[i];
         }
     }
-    list_info->arr[--list_info->elements_count] = 0;
+    list_info->arr[--list_info->elements_count] = nullptr;
 
     return NSK_TRUE;
 }