diff --git a/src/proto/vim9instr.pro b/src/proto/vim9instr.pro
index e92fe10..6b70362 100644
--- a/src/proto/vim9instr.pro
+++ b/src/proto/vim9instr.pro
@@ -5,6 +5,7 @@
 isn_T *generate_instr_debug(cctx_T *cctx);
 int generate_CONSTRUCT(cctx_T *cctx, class_T *cl);
 int generate_GET_OBJ_MEMBER(cctx_T *cctx, int idx, type_T *type);
+int generate_GET_ITF_MEMBER(cctx_T *cctx, class_T *itf, int itf_idx, type_T *type);
 int generate_STORE_THIS(cctx_T *cctx, int idx);
 int may_generate_2STRING(int offset, int tolerant, cctx_T *cctx);
 int generate_add_instr(cctx_T *cctx, vartype_T vartype, type_T *type1, type_T *type2, exprtype_T expr_type);