diff --git a/include/mruby/error.h b/include/mruby/error.h
index 36706246b..46166ec54 100644
--- a/include/mruby/error.h
+++ b/include/mruby/error.h
@@ -34,7 +34,6 @@ struct RException {
 MRB_API mrb_noreturn void mrb_sys_fail(mrb_state *mrb, const char *mesg);
 MRB_API mrb_value mrb_exc_new_str(mrb_state *mrb, struct RClass* c, mrb_value str);
 #define mrb_exc_new_lit(mrb, c, lit) mrb_exc_new_str(mrb, c, mrb_str_new_lit(mrb, lit))
-MRB_API mrb_value mrb_make_exception(mrb_state *mrb, mrb_int argc, const mrb_value *argv);
 MRB_API mrb_noreturn void mrb_no_method_error(mrb_state *mrb, mrb_sym id, mrb_value args, const char *fmt, ...);
 
 #if defined(MRB_64BIT) || defined(MRB_USE_FLOAT32) || defined(MRB_NAN_BOXING) || defined(MRB_WORD_BOXING)
diff --git a/include/mruby/internal.h b/include/mruby/internal.h
index dff80d575..0a3f605ee 100644
--- a/include/mruby/internal.h
+++ b/include/mruby/internal.h
@@ -52,6 +52,7 @@ mrb_value mrb_get_backtrace(mrb_state *mrb);
 void mrb_exc_mesg_set(mrb_state *mrb, struct RException *exc, mrb_value mesg);
 mrb_value mrb_exc_mesg_get(mrb_state *mrb, struct RException *exc);
 mrb_value mrb_f_raise(mrb_state*, mrb_value);
+mrb_value mrb_make_exception(mrb_state *mrb, mrb_int argc, const mrb_value *argv);
 
 /* gc */
 void mrb_gc_mark_mt(mrb_state*, struct RClass*);
diff --git a/src/error.c b/src/error.c
index 9bbb34c83..c48331f7f 100644
--- a/src/error.c
+++ b/src/error.c
@@ -458,7 +458,7 @@ mrb_bug(mrb_state *mrb, const char *fmt, ...)
   exit(EXIT_FAILURE);
 }
 
-MRB_API mrb_value
+mrb_value
 mrb_make_exception(mrb_state *mrb, mrb_int argc, const mrb_value *argv)
 {
   mrb_value mesg;