diff --git a/src/proto/memline.pro b/src/proto/memline.pro
index 1ebd7eb..4f75853 100644
--- a/src/proto/memline.pro
+++ b/src/proto/memline.pro
@@ -24,6 +24,7 @@
 void ml_setmarked __ARGS((linenr_T lnum));
 linenr_T ml_firstmarked __ARGS((void));
 void ml_clearmarked __ARGS((void));
+char_u *makeswapname __ARGS((char_u *fname, char_u *ffname, buf_T *buf, char_u *dir_name));
 char_u *get_file_in_dir __ARGS((char_u *fname, char_u *dname));
 void ml_setflags __ARGS((buf_T *buf));
 long ml_find_line_or_offset __ARGS((buf_T *buf, linenr_T lnum, long *offp));