diff --git a/src/proto/eval.pro b/src/proto/eval.pro
index a2a4a8d..5fc6260 100644
--- a/src/proto/eval.pro
+++ b/src/proto/eval.pro
@@ -123,6 +123,7 @@
 void assert_match_common(typval_T *argvars, assert_type_T atype);
 void assert_inrange(typval_T *argvars);
 void assert_bool(typval_T *argvars, int isTrue);
+void assert_report(typval_T *argvars);
 void assert_exception(typval_T *argvars);
 void assert_fails(typval_T *argvars);
 void fill_assert_error(garray_T *gap, typval_T *opt_msg_tv, char_u *exp_str, typval_T *exp_tv, typval_T *got_tv, assert_type_T atype);