diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 72a6292101..4a4fa054c8 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-02-11  Tom Tromey  <tom@tromey.com>
+
+	* gdb_obstack.h (struct auto_obstack): Use
+	DISABLE_COPY_AND_ASSIGN.
+
 2020-02-11  Tom Tromey  <tom@tromey.com>
 
 	* dwarf2/frame.h (struct objfile): Don't forward declare.
diff --git a/gdb/gdb_obstack.h b/gdb/gdb_obstack.h
index fb9295f502..9b1d907678 100644
--- a/gdb/gdb_obstack.h
+++ b/gdb/gdb_obstack.h
@@ -125,6 +125,8 @@ struct auto_obstack : obstack
   ~auto_obstack ()
   { obstack_free (this, NULL); }
 
+  DISABLE_COPY_AND_ASSIGN (auto_obstack);
+
   /* Free all memory in the obstack but leave it valid for further
      allocation.  */
   void clear ()