diff --git a/std/math/big/int.jule b/std/math/big/int.jule
index 34a2ca1ed..f2af71d58 100644
--- a/std/math/big/int.jule
+++ b/std/math/big/int.jule
@@ -169,9 +169,9 @@ impl Int {
         if self.len() > 63 {
             error(if self.neg { i64.MIN } else { i64.MAX })
         }
-        let x = i64(self.nat.to_u64() else { error(error) })
+        let x = i64(u64_from_bits(self.nat.bits))
         if self.neg {
-            ret -x
+            ret i64.MIN + x
         }
         ret x
     }