diff --git a/src/proto/ex_eval.pro b/src/proto/ex_eval.pro
index 9274bce..34301e2 100644
--- a/src/proto/ex_eval.pro
+++ b/src/proto/ex_eval.pro
@@ -7,7 +7,7 @@
 void free_global_msglist(void);
 void do_errthrow(struct condstack *cstack, char_u *cmdname);
 int do_intthrow(struct condstack *cstack);
-char_u *get_exception_string(void *value, except_type_T type, char_u *cmdname, int *should_free);
+char *get_exception_string(void *value, except_type_T type, char_u *cmdname, int *should_free);
 void discard_current_exception(void);
 void report_make_pending(int pending, void *value);
 void report_resume_pending(int pending, void *value);