diff --git a/src/CustomTag.php b/src/CustomTag.php
index ce1327a..7910d42 100644
--- a/src/CustomTag.php
+++ b/src/CustomTag.php
@@ -3,6 +3,8 @@
 
 namespace LordSimal\CustomHtmlElements;
 
+use ReflectionObject;
+
 abstract class CustomTag
 {
     /**
@@ -23,8 +25,14 @@ public function __construct(
         public string $innerContent = '',
     ) {
         // Overwrite properties with what is given in the attributes
+        $reflection = new ReflectionObject($this);
         foreach ($attributes as $key => $value) {
-            if (isset($this->$key)) {
+            if (
+                $reflection->hasProperty($key)
+                && $reflection->getProperty($key)->isPublic()
+                && !$reflection->getProperty($key)->isStatic()
+                && $reflection->getProperty($key)->getDeclaringClass()->getName() !== self::class
+            ) {
                 $this->$key = $value;
             }
         }
diff --git a/tests/TagEngine/CustomTagsTest.php b/tests/TagEngine/CustomTagsTest.php
index ed3977b..377104a 100644
--- a/tests/TagEngine/CustomTagsTest.php
+++ b/tests/TagEngine/CustomTagsTest.php
@@ -4,6 +4,7 @@
 namespace LordSimal\CustomHtmlElements\Test\TagEngine;
 
 use LordSimal\CustomHtmlElements\TagEngine;
+use LordSimal\CustomHtmlElements\Test\Tags\ClassProperties;
 use PHPUnit\Framework\TestCase;
 
 /**
@@ -11,6 +12,13 @@
  */
 class CustomTagsTest extends TestCase
 {
+    public function testHydratesNullablePublicProperty(): void
+    {
+        $tag = new ClassProperties(['nullable' => 'value']);
+
+        $this->assertSame('value', $tag->nullable);
+    }
+
     protected TagEngine $tagEngine;
 
     protected function setUp(): void
diff --git a/tests/Tags/ClassProperties.php b/tests/Tags/ClassProperties.php
index a4be9f0..c1b33e9 100644
--- a/tests/Tags/ClassProperties.php
+++ b/tests/Tags/ClassProperties.php
@@ -14,6 +14,8 @@ class ClassProperties extends CustomTag
 
     public string $test = 'default';
 
+    public ?string $nullable = null;
+
     public function render(): string
     {
         return <<< HTML