1 files changed, 0 insertions, 1 deletions
diff --git a/src/error.h b/src/error.h
index 91d6595ff..53ee2b206 100644
--- a/src/error.h
+++ b/src/error.h
@@ -8,7 +8,6 @@
 #define MRUBY_ERROR_H
 
 void mrb_sys_fail(mrb_state *mrb, const char *mesg);
-void mrb_bug_errno(const char*, int);
 int sysexit_status(mrb_state *mrb, mrb_value err);
 mrb_value mrb_exc_new3(mrb_state *mrb, struct RClass* c, mrb_value str);
 mrb_value make_exception(mrb_state *mrb, int argc, mrb_value *argv, int isstr);