diff --git a/internal.h b/internal.h
index 7cd04756cc..071f3ed6af 100644
--- a/internal.h
+++ b/internal.h
@@ -911,7 +911,6 @@ VALUE rb_sourcefilename(void);
 void rb_vm_pop_cfunc_frame(void);
 
 /* vm_dump.c */
-void rb_vm_bugreport(void);
 void rb_print_backtrace(void);
 
 /* vm_eval.c */