diff --git a/Auxiliary/cmake-mode.el b/Auxiliary/cmake-mode.el
index b35d369e6..f29b59bd7 100644
--- a/Auxiliary/cmake-mode.el
+++ b/Auxiliary/cmake-mode.el
@@ -271,7 +271,7 @@ optional argument topic will be appended to the argument list."
     (save-selected-window
       (select-window (display-buffer buffer 'not-this-window))
       (cmake-mode)
-      (toggle-read-only t))
+      (read-only-mode 1))
     )
   )