diff --git a/WordPress/Tests/NamingConventions/PrefixAllGlobalsUnitTest.1.inc b/WordPress/Tests/NamingConventions/PrefixAllGlobalsUnitTest.1.inc
index cdbe22dbcb..7f0c89d8c0 100644
--- a/WordPress/Tests/NamingConventions/PrefixAllGlobalsUnitTest.1.inc
+++ b/WordPress/Tests/NamingConventions/PrefixAllGlobalsUnitTest.1.inc
@@ -276,7 +276,7 @@ apply_filters( $_REQUEST['else'] ); // Warning.
 
 class Acronym_Dynamic_Hooks {
 	const FILTER = 'acronym';
-	const FILTER_WITH_UNDERSCORE = 'acronym_';
+	const ?string FILTER_WITH_UNDERSCORE = 'acronym_';
 
 	protected $filter = 'acronym';
 	protected $filter_with_underscore = 'acronym_';
diff --git a/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc b/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc
index 2f12d2f804..21a09a5ed4 100644
--- a/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc
+++ b/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc
@@ -231,3 +231,16 @@ echo Some\Enum\WordPress::ENUM_CONSTANT;
 
 // Safeguard that the sniff doesn't act on anonymous classes.
 $anon = new class() {};
+
+/*
+ * Safeguard that PHP 8.3+ typed class constants are handled correctly (i.e. ignored).
+ */
+class TypeClassConstants {
+    public const string WORDPRESS = 'wordress';
+
+    public const ?string ANOTHER = 'value',
+        WORDPRESS_SOMETHING = 'wordpress';
+
+	// Ensures no false positives on incorrect casing in a class constant type name.
+    public const (\Fully\Qualified\MyClass&wordPRESS)|string ANOTHER_WORDPRESS = 'wordpress';
+}
diff --git a/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc.fixed b/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc.fixed
index bab1c4b13c..e3cf619520 100644
--- a/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc.fixed
+++ b/WordPress/Tests/WP/CapitalPDangitUnitTest.1.inc.fixed
@@ -231,3 +231,16 @@ echo Some\Enum\WordPress::ENUM_CONSTANT;
 
 // Safeguard that the sniff doesn't act on anonymous classes.
 $anon = new class() {};
+
+/*
+ * Safeguard that PHP 8.3+ typed class constants are handled correctly (i.e. ignored).
+ */
+class TypeClassConstants {
+    public const string WORDPRESS = 'wordress';
+
+    public const ?string ANOTHER = 'value',
+        WORDPRESS_SOMETHING = 'wordpress';
+
+	// Ensures no false positives on incorrect casing in a class constant type name.
+    public const (\Fully\Qualified\MyClass&wordPRESS)|string ANOTHER_WORDPRESS = 'wordpress';
+}