diff --git a/src/xdisp.c b/src/xdisp.c
index 8b8434c13ad..d6881d42e15 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -242,6 +242,7 @@ message_dolog (m, len, nlflag)
 
       oldbuf = current_buffer;
       Fset_buffer (Fget_buffer_create (build_string ("*Messages*")));
+      current_buffer->undo_list = Qt;
       oldpoint = PT;
       oldbegv = BEGV;
       oldzv = ZV;