diff --git a/NEWS.md b/NEWS.md
index 2435498da9af12..da8c494b4b3ed1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -269,11 +269,6 @@ Note: We're only listing outstanding class updates.
     * Introduce support for `Thread#raise(cause:)` argument similar to
       `Kernel#raise`. [[Feature #21360]]
 
-* Pathname
-
-    * Pathname has been promoted from a default gem to a core class of Ruby.
-      [[Feature #17473]]
-
 ## Stdlib updates
 
 The following bundled gems are promoted from default gems.
diff --git a/box.c b/box.c
index 54bd5c6258343f..616a8acf7d88b5 100644
--- a/box.c
+++ b/box.c
@@ -759,6 +759,7 @@ rb_box_cleanup_local_extension(VALUE cleanup)
 #ifndef _WIN32
     if (p) box_ext_cleanup_free(p);
 #endif
+    (void)p;
 }
 
 static int