diff --git a/src/proto/ex_cmds2.pro b/src/proto/ex_cmds2.pro
index 0d249cb..c12e0d7 100644
--- a/src/proto/ex_cmds2.pro
+++ b/src/proto/ex_cmds2.pro
@@ -81,6 +81,7 @@
 void scriptnames_slash_adjust(void);
 char_u *get_scriptname(scid_T id);
 void free_scriptnames(void);
+linenr_T get_sourced_lnum(char_u *(*fgetline)(int, void *, int, int), void *cookie);
 char_u *getsourceline(int c, void *cookie, int indent, int do_concat);
 void script_line_start(void);
 void script_line_exec(void);