diff --git a/src/proto/undo.pro b/src/proto/undo.pro
index 1397dc5..e712f03 100644
--- a/src/proto/undo.pro
+++ b/src/proto/undo.pro
@@ -1,22 +1,22 @@
 /* undo.c */
-extern int u_save_cursor __ARGS((void));
-extern int u_save __ARGS((linenr_T top, linenr_T bot));
-extern int u_savesub __ARGS((linenr_T lnum));
-extern int u_inssub __ARGS((linenr_T lnum));
-extern int u_savedel __ARGS((linenr_T lnum, long nlines));
-extern int undo_allowed __ARGS((void));
-extern void u_undo __ARGS((int count));
-extern void u_redo __ARGS((int count));
-extern void undo_time __ARGS((long step, int sec, int absolute));
-extern void u_sync __ARGS((int force));
-extern void ex_undolist __ARGS((exarg_T *eap));
-extern void ex_undojoin __ARGS((exarg_T *eap));
-extern void u_unchanged __ARGS((buf_T *buf));
-extern void u_clearall __ARGS((buf_T *buf));
-extern void u_saveline __ARGS((linenr_T lnum));
-extern void u_clearline __ARGS((void));
-extern void u_undoline __ARGS((void));
-extern void u_blockfree __ARGS((buf_T *buf));
-extern int bufIsChanged __ARGS((buf_T *buf));
-extern int curbufIsChanged __ARGS((void));
+int u_save_cursor __ARGS((void));
+int u_save __ARGS((linenr_T top, linenr_T bot));
+int u_savesub __ARGS((linenr_T lnum));
+int u_inssub __ARGS((linenr_T lnum));
+int u_savedel __ARGS((linenr_T lnum, long nlines));
+int undo_allowed __ARGS((void));
+void u_undo __ARGS((int count));
+void u_redo __ARGS((int count));
+void undo_time __ARGS((long step, int sec, int absolute));
+void u_sync __ARGS((int force));
+void ex_undolist __ARGS((exarg_T *eap));
+void ex_undojoin __ARGS((exarg_T *eap));
+void u_unchanged __ARGS((buf_T *buf));
+void u_clearall __ARGS((buf_T *buf));
+void u_saveline __ARGS((linenr_T lnum));
+void u_clearline __ARGS((void));
+void u_undoline __ARGS((void));
+void u_blockfree __ARGS((buf_T *buf));
+int bufIsChanged __ARGS((buf_T *buf));
+int curbufIsChanged __ARGS((void));
 /* vim: set ft=c : */