diff --git a/src/proto/change.pro b/src/proto/change.pro
index 79306e3..de3a94a 100644
--- a/src/proto/change.pro
+++ b/src/proto/change.pro
@@ -14,7 +14,7 @@
 void deleted_lines(linenr_T lnum, long count);
 void deleted_lines_mark(linenr_T lnum, long count);
 void changed_lines(linenr_T lnum, colnr_T col, linenr_T lnume, long xtra);
-void unchanged(buf_T *buf, int ff);
+void unchanged(buf_T *buf, int ff, int always_inc_changedtick);
 void ins_bytes(char_u *p);
 void ins_bytes_len(char_u *p, int len);
 void ins_char(int c);