diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index afdfd0f8e..f4d2beeb1 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -1831,19 +1831,6 @@ mrb_bint_or(mrb_state *mrb, mrb_value x, mrb_value y)
   return bint_norm(mrb, bint_new(mrb, &c));
 }
 
-mrb_value
-mrb_bint_neg(mrb_state *mrb, mrb_value x)
-{
-  mpz_t a, b;
-
-  bint_as_mpz(RBIGINT(x), &a);
-  mpz_init(mrb, &b);
-  mpz_neg(mrb, &b, &a);
-  struct RBigint *b2 = bint_new(mrb, &b);
-  /* no normalization */
-  return mrb_obj_value(b2);
-}
-
 mrb_value
 mrb_bint_xor(mrb_state *mrb, mrb_value x, mrb_value y)
 {
@@ -1868,6 +1855,19 @@ mrb_bint_xor(mrb_state *mrb, mrb_value x, mrb_value y)
   return bint_norm(mrb, bint_new(mrb, &c));
 }
 
+mrb_value
+mrb_bint_neg(mrb_state *mrb, mrb_value x)
+{
+  mpz_t a, b;
+
+  bint_as_mpz(RBIGINT(x), &a);
+  mpz_init(mrb, &b);
+  mpz_neg(mrb, &b, &a);
+  struct RBigint *b2 = bint_new(mrb, &b);
+  /* no normalization */
+  return mrb_obj_value(b2);
+}
+
 mrb_value
 mrb_bint_rev(mrb_state *mrb, mrb_value x)
 {