diff --git a/src/proto/regexp.pro b/src/proto/regexp.pro
index 2ff3b25..3fd91ee 100644
--- a/src/proto/regexp.pro
+++ b/src/proto/regexp.pro
@@ -10,6 +10,7 @@
 char_u *regtilde(char_u *source, int magic);
 int vim_regsub(regmatch_T *rmp, char_u *source, typval_T *expr, char_u *dest, int destlen, int flags);
 int vim_regsub_multi(regmmatch_T *rmp, linenr_T lnum, char_u *source, char_u *dest, int destlen, int flags);
+void free_resub_eval_result(void);
 char_u *reg_submatch(int no);
 list_T *reg_submatch_list(int no);
 int vim_regcomp_had_eol(void);