diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index 5477ec329..97f545473 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -1022,13 +1022,6 @@ bint_new_int(mrb_state *mrb, mrb_int x)
   return b;
 }
 
-mrb_value
-mrb_bint_new(mrb_state *mrb)
-{
-  struct RBigint *b = bint_new(mrb);
-  return mrb_obj_value(b);
-}
-
 mrb_value
 mrb_bint_new_int(mrb_state *mrb, mrb_int x)
 {