diff --git a/scp.h b/scp.h
index c0afe6ae..f4d74fd3 100644
--- a/scp.h
+++ b/scp.h
@@ -251,6 +251,7 @@ const char *sim_fmt_secs (double seconds);
 const char *sim_fmt_numeric (double number);
 const char *sprint_capac (DEVICE *dptr, UNIT *uptr);
 char *read_line (char *cptr, int32 size, FILE *stream);
+char *read_line_p (const char *prompt, char *ptr, int32 size, FILE *stream);
 void fprint_reg_help (FILE *st, DEVICE *dptr);
 void fprint_set_help (FILE *st, DEVICE *dptr);
 void fprint_show_help (FILE *st, DEVICE *dptr);