diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68244d7c..0d8cfe99 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Fix support for 32bits PHP ([#817](https://github.com/jsonrainbow/json-schema/pull/817))
 
 ## [6.4.0] - 2025-04-01
 ### Added
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index d708b079..7e4ba4a4 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -25,6 +25,11 @@ parameters:
 			count: 1
 			path: src/JsonSchema/Constraints/BaseConstraint.php
 
+		-
+			message: "#^Property JsonSchema\\\\Constraints\\\\BaseConstraint\\:\\:\\$errorMask \\(int\\<\\-1, 3\\>\\) does not accept int\\.$#"
+			count: 1
+			path: src/JsonSchema/Constraints/BaseConstraint.php
+
 		-
 			message: "#^Property JsonSchema\\\\Constraints\\\\BaseConstraint\\:\\:\\$errors type has no value type specified in iterable type array\\.$#"
 			count: 1
diff --git a/src/JsonSchema/Validator.php b/src/JsonSchema/Validator.php
index d8c83876..0845b0cb 100644
--- a/src/JsonSchema/Validator.php
+++ b/src/JsonSchema/Validator.php
@@ -27,10 +27,10 @@ class Validator extends BaseConstraint
 {
     public const SCHEMA_MEDIA_TYPE = 'application/schema+json';
 
-    public const ERROR_NONE                    = 0x00000000;
-    public const ERROR_ALL                     = 0xFFFFFFFF;
-    public const ERROR_DOCUMENT_VALIDATION     = 0x00000001;
-    public const ERROR_SCHEMA_VALIDATION       = 0x00000002;
+    public const ERROR_NONE                    = 0;
+    public const ERROR_ALL                     = -1;
+    public const ERROR_DOCUMENT_VALIDATION     = 1;
+    public const ERROR_SCHEMA_VALIDATION       = 2;
 
     /**
      * Validates the given data against the schema and returns an object containing the results