diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index cb04635..89effa1 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -2041,7 +2041,7 @@
 }
 
 /*
- * flush all buffers, except the ones that are readonly
+ * Flush all buffers, except the ones that are readonly or are never written.
  */
     void
 autowrite_all(void)
@@ -2051,7 +2051,7 @@
     if (!(p_aw || p_awa) || !p_write)
 	return;
     FOR_ALL_BUFFERS(buf)
-	if (bufIsChanged(buf) && !buf->b_p_ro)
+	if (bufIsChanged(buf) && !buf->b_p_ro && !bt_dontwrite(buf))
 	{
 	    bufref_T	bufref;