diff --git a/include/mruby/internal.h b/include/mruby/internal.h
index 5a6c58f55..2e411ce6e 100644
--- a/include/mruby/internal.h
+++ b/include/mruby/internal.h
@@ -189,7 +189,6 @@ mrb_value mrb_bint_divmod(mrb_state *mrb, mrb_value x, mrb_value y);
 mrb_value mrb_bint_add_ii(mrb_state *mrb, mrb_int x, mrb_int y);
 mrb_value mrb_bint_sub_ii(mrb_state *mrb, mrb_int x, mrb_int y);
 mrb_value mrb_bint_mul_ii(mrb_state *mrb, mrb_int x, mrb_int y);
-mrb_value mrb_bint_div_ii(mrb_state *mrb, mrb_int x, mrb_int y);
 mrb_value mrb_bint_mod(mrb_state *mrb, mrb_value x, mrb_value y);
 mrb_value mrb_bint_rem(mrb_state *mrb, mrb_value x, mrb_value y);
 mrb_value mrb_bint_pow(mrb_state *mrb, mrb_value x, mrb_value y);
diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index 35d3c1f41..7ba9b1adf 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -1299,20 +1299,6 @@ mrb_bint_mul_ii(mrb_state *mrb, mrb_int x, mrb_int y)
   return bint_norm(mrb, b);
 }
 
-mrb_value
-mrb_bint_div_ii(mrb_state *mrb, mrb_int x, mrb_int y)
-{
-  struct RBigint *b = bint_new(mrb);
-  mpz_t z1, z2;
-
-  mpz_init_set_int(mrb, &z1, x);
-  mpz_init_set_int(mrb, &z2, y);
-  mpz_mdiv(mrb, &b->mp, &z1, &z2);
-  mpz_clear(mrb, &z1);
-  mpz_clear(mrb, &z2);
-  return bint_norm(mrb, b);
-}
-
 mrb_value
 mrb_bint_mod(mrb_state *mrb, mrb_value x, mrb_value y)
 {