diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index 21930872f..422969295 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -1188,7 +1188,7 @@ mrb_bint_new_int64(mrb_state *mrb, int64_t n)
 {
   mpz_t x;
   mpz_set_int64(mrb, &x, n);
-  struct RBigint *b = bint_new_int(mrb, x);
+  struct RBigint *b = bint_new(mrb, &x);
   return mrb_obj_value(b);
 }
 #endif