diff --git a/src/proto/move.pro b/src/proto/move.pro
index 00b4d29..0858e26 100644
--- a/src/proto/move.pro
+++ b/src/proto/move.pro
@@ -43,7 +43,7 @@
 void scroll_cursor_top(int min_scroll, int always);
 void set_empty_rows(win_T *wp, int used);
 void scroll_cursor_bot(int min_scroll, int set_topbot);
-void scroll_cursor_halfway(int atend);
+void scroll_cursor_halfway(int atend, int prefer_above);
 void cursor_correct(void);
 int onepage(int dir, long count);
 void halfpage(int flag, linenr_T Prenum);