diff --git a/src/TicketSwapErrorFormatter.php b/src/TicketSwapErrorFormatter.php
index bd91324..72defc1 100644
--- a/src/TicketSwapErrorFormatter.php
+++ b/src/TicketSwapErrorFormatter.php
@@ -245,7 +245,7 @@ public static function highlight(string $message, ?string $tip, ?string $identif
 
         // Types
         $message = (string) preg_replace(
-            '/(?<=[\s\|\(><])(null|true|false|int|float|bool|([-\w]+-)?string|Stringable|array|object|mixed|resource|iterable|void|callable)(?=[:]{2}|[\.\s\|><,\(\)\{\}]+)/',
+            '/(?<=[\s\|\(><])(null|true|false|int|float|bool|([-\w]+-)?string|Stringable|array|object|mixed|resource|iterable|void|callable|stdClass)(?=[:]{2}|[\.\s\|><,\(\)\{\}]+)/',
             '<fg=magenta>$1</>',
             $message,
         );
diff --git a/tests/TicketSwapErrorFormatterTest.php b/tests/TicketSwapErrorFormatterTest.php
index fc3b5e5..d2e1ba9 100644
--- a/tests/TicketSwapErrorFormatterTest.php
+++ b/tests/TicketSwapErrorFormatterTest.php
@@ -217,6 +217,13 @@ public static function provideHighlight() : iterable
             null,
             true
         ];
+        yield [
+            'Property <fg=yellow>App\Models\ExampleModel</>::<fg=green>$example_property</> (<fg=magenta>stdClass</>|<fg=magenta>null</>) does not accept <fg=magenta>mixed</>.',
+            'Property App\Models\ExampleModel::$example_property (stdClass|null) does not accept mixed.',
+            null,
+            null,
+            true,
+        ];
     }
 
     /**