diff --git a/src/proto/vim9instr.pro b/src/proto/vim9instr.pro
index 7c13f93..898eb97 100644
--- a/src/proto/vim9instr.pro
+++ b/src/proto/vim9instr.pro
@@ -69,6 +69,7 @@
 int generate_ECHOWINDOW(cctx_T *cctx, int count, long time);
 int generate_SOURCE(cctx_T *cctx, int sid);
 int generate_PUT(cctx_T *cctx, int regname, linenr_T lnum);
+int generate_LOCKUNLOCK(cctx_T *cctx, char_u *line, int is_arg);
 int generate_EXEC_copy(cctx_T *cctx, isntype_T isntype, char_u *line);
 int generate_EXEC(cctx_T *cctx, isntype_T isntype, char_u *str);
 int generate_LEGACY_EVAL(cctx_T *cctx, char_u *line);