diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index 300e8be..56a575e 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -106,4 +106,5 @@
 int mch_parse_cmd(char_u *cmd, int use_shcf, char ***argv, int *argc);
 int build_argv_from_string(char_u *cmd, char ***argv, int *argc);
 int build_argv_from_list(list_T *l, char ***argv, int *argc);
+int get_special_pty_type(void);
 /* vim: set ft=c : */