diff --git a/src/proto/vim9class.pro b/src/proto/vim9class.pro
index 9a6b23f..8ae20eb 100644
--- a/src/proto/vim9class.pro
+++ b/src/proto/vim9class.pro
@@ -5,6 +5,7 @@
 void ex_enum(exarg_T *eap);
 void ex_type(exarg_T *eap);
 int class_object_index(char_u **arg, typval_T *rettv, evalarg_T *evalarg, int verbose);
+ufunc_T *find_class_func(char_u **arg);
 void copy_object(typval_T *from, typval_T *to);
 void object_unref(object_T *obj);
 void copy_class(typval_T *from, typval_T *to);