diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index f9bd487..ed7e08c 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -3811,8 +3811,9 @@
  *
  * VIM      Prolog
  * 6.2      1.3
+ * 7.0      1.4
  */
-#define PRT_PROLOG_VERSION  ((char_u *)"1.3")
+#define PRT_PROLOG_VERSION  ((char_u *)"1.4")
 
 /* String versions of PS resource types - indexed by constants above so don't
  * re-order!
@@ -5116,6 +5117,10 @@
 
     prt_dsc_noarg("EOF");
 
+    /* Write CTRL-D to close serial communication link if used.
+     * NOTHING MUST BE WRITTEN AFTER THIS! */
+    prt_write_file(IF_EB("\004", "\067"));
+
     if (!prt_file_error && psettings->outfile == NULL
 					&& !got_int && !psettings->user_abort)
     {