diff --git a/libc/src/__support/big_int.h b/libc/src/__support/big_int.h
index 82a5251418854a..8eeb4db9d650ba 100644
--- a/libc/src/__support/big_int.h
+++ b/libc/src/__support/big_int.h
@@ -732,7 +732,8 @@ struct BigInt {
   }
 
   LIBC_INLINE constexpr BigInt operator%=(const BigInt &other) {
-    return *this->div(other);
+    *this = *this % other;
+    return *this;
   }
 
   LIBC_INLINE constexpr BigInt &operator*=(const BigInt &other) {