diff --git a/src/Tools/SchemaValidator.php b/src/Tools/SchemaValidator.php
index 6ebe991876c..7b4e6176a41 100644
--- a/src/Tools/SchemaValidator.php
+++ b/src/Tools/SchemaValidator.php
@@ -39,6 +39,7 @@
 use function in_array;
 use function interface_exists;
 use function is_a;
+use function method_exists;
 use function sprintf;
 
 /**
@@ -49,9 +50,9 @@
 class SchemaValidator
 {
     /**
-     * It maps built-in Doctrine types to PHP types
+     * Map built-in Doctrine DBAL 3 types to PHP types
      */
-    private const BUILTIN_TYPES_MAP = [
+    private const BUILTIN_TYPES_MAP_DBAL3 = [
         AsciiStringType::class => 'string',
         BigIntType::class => 'string',
         BooleanType::class => 'bool',
@@ -66,6 +67,24 @@ class SchemaValidator
         TextType::class => 'string',
     ];
 
+    /**
+     * Map built-in Doctrine DBAL 4+ types to PHP types
+     */
+    private const BUILTIN_TYPES_MAP = [
+        AsciiStringType::class => 'string',
+        BigIntType::class => 'string|int',
+        BooleanType::class => 'bool',
+        DecimalType::class => 'string',
+        FloatType::class => 'float',
+        GuidType::class => 'string',
+        IntegerType::class => 'int',
+        JsonType::class => 'array',
+        SimpleArrayType::class => 'array',
+        SmallIntType::class => 'int',
+        StringType::class => 'string',
+        TextType::class => 'string',
+    ];
+
     public function __construct(
         private readonly EntityManagerInterface $em,
         private readonly bool $validatePropertyTypes = true,
@@ -436,6 +455,10 @@ private function findBuiltInType(Type $type): string|null
     {
         $typeName = $type::class;
 
-        return self::BUILTIN_TYPES_MAP[$typeName] ?? null;
+        if (method_exists(BigIntType::class, 'getName')) { // DBAL 3
+            return self::BUILTIN_TYPES_MAP_DBAL3[$typeName] ?? null;
+        } else { // DBAL 4+
+            return self::BUILTIN_TYPES_MAP[$typeName] ?? null;
+        }
     }
 }
diff --git a/tests/Tests/ORM/Tools/SchemaValidatorTest.php b/tests/Tests/ORM/Tools/SchemaValidatorTest.php
index b7141b0d99d..a153e4e77b6 100644
--- a/tests/Tests/ORM/Tools/SchemaValidatorTest.php
+++ b/tests/Tests/ORM/Tools/SchemaValidatorTest.php
@@ -6,6 +6,8 @@
 
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
+use Doctrine\DBAL\Types\BigIntType;
+use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\DiscriminatorMap;
@@ -30,6 +32,8 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 
+use function method_exists;
+
 class SchemaValidatorTest extends OrmTestCase
 {
     private EntityManagerInterface|null $em = null;
@@ -228,6 +232,47 @@ public function testInvalidAssociationTowardsMappedSuperclass(): void
             $ce,
         );
     }
+
+    public function testBigintMappedToStringInt(): void
+    {
+        $class = $this->em->getClassMetadata(BigintMappedToStringInt::class);
+        $ce    = $this->validator->validateClass($class);
+
+        $this->assertEquals([], $ce); // Same for DBAL 3 and 4+
+    }
+
+    public function testBigintMappedToInt(): void
+    {
+        $class = $this->em->getClassMetadata(BigintMappedToInt::class);
+        $ce    = $this->validator->validateClass($class);
+
+        if (method_exists(BigIntType::class, 'getName')) { // DBAL 3
+            $this->assertEquals(
+                ["The field 'Doctrine\Tests\ORM\Tools\BigintMappedToInt#bigint' has the property type 'int' that differs from the metadata field type 'string' returned by the 'bigint' DBAL type."],
+                $ce,
+            );
+        } else { // DBAL 4+
+            $this->assertEquals(
+                ["The field 'Doctrine\Tests\ORM\Tools\BigintMappedToInt#bigint' has the property type 'int' that differs from the metadata field type 'string|int' returned by the 'bigint' DBAL type."],
+                $ce,
+            );
+        }
+    }
+
+    public function testBigintMappedToString(): void
+    {
+        $class = $this->em->getClassMetadata(BigintMappedToString::class);
+        $ce    = $this->validator->validateClass($class);
+
+        if (method_exists(BigIntType::class, 'getName')) { // DBAL 3
+            $this->assertEquals([], $ce);
+        } else { // DBAL 4+
+            $this->assertEquals(
+                ["The field 'Doctrine\Tests\ORM\Tools\BigintMappedToString#bigint' has the property type 'string' that differs from the metadata field type 'string|int' returned by the 'bigint' DBAL type."],
+                $ce,
+            );
+        }
+    }
 }
 
 #[MappedSuperclass]
@@ -547,3 +592,39 @@ class InvalidMappedSuperClass
     #[ManyToMany(targetEntity: 'InvalidMappedSuperClass', mappedBy: 'invalid')]
     private $selfWhatever;
 }
+
+#[Entity]
+class BigintMappedToStringInt
+{
+    #[Id]
+    #[Column]
+    #[GeneratedValue]
+    private int $id;
+
+    #[Column(type: Types::BIGINT)]
+    private string|int $bigint;
+}
+
+#[Entity]
+class BigintMappedToInt
+{
+    #[Id]
+    #[Column]
+    #[GeneratedValue]
+    private int $id;
+
+    #[Column(type: Types::BIGINT)]
+    private int $bigint;
+}
+
+#[Entity]
+class BigintMappedToString
+{
+    #[Id]
+    #[Column]
+    #[GeneratedValue]
+    private int $id;
+
+    #[Column(type: Types::BIGINT)]
+    private string $bigint;
+}