diff --git a/make/jdk/src/classes/build/tools/intpoly/FieldGen.java b/make/jdk/src/classes/build/tools/intpoly/FieldGen.java
index 2bf8c5c0b2001..fcc45db021964 100644
--- a/make/jdk/src/classes/build/tools/intpoly/FieldGen.java
+++ b/make/jdk/src/classes/build/tools/intpoly/FieldGen.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -628,7 +628,7 @@ private String generate(FieldParams params) throws IOException {
         result.appendLine("private static final long CARRY_ADD = 1 << "
                 + (params.getBitsPerLimb() - 1) + ";");
         if (params.getBitsPerLimb() * params.getNumLimbs() != params.getPower()) {
-            result.appendLine("private static final int LIMB_MASK = -1 "
+            result.appendLine("private static final long LIMB_MASK = -1L "
                     + ">>> (64 - BITS_PER_LIMB);");
         }