1 files changed, 1 insertions, 1 deletions
diff --git a/mjit.h b/mjit.h
index ff16c0fca4..256bf65a29 100644
--- a/mjit.h
+++ b/mjit.h
@@ -80,7 +80,7 @@ extern void rb_mjit_recompile_iseq(const rb_iseq_t *iseq);
 RUBY_SYMBOL_EXPORT_END
 
 extern bool mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname);
-extern void mjit_init(struct mjit_options *opts);
+extern void mjit_init(const struct mjit_options *opts);
 extern void mjit_gc_start_hook(void);
 extern void mjit_gc_exit_hook(void);
 extern void mjit_free_iseq(const rb_iseq_t *iseq);