diff --git a/src/Tools/SchemaValidator.php b/src/Tools/SchemaValidator.php
index 7b4e6176a41..6ebe991876c 100644
--- a/src/Tools/SchemaValidator.php
+++ b/src/Tools/SchemaValidator.php
@@ -39,7 +39,6 @@
 use function in_array;
 use function interface_exists;
 use function is_a;
-use function method_exists;
 use function sprintf;
 
 /**
@@ -50,29 +49,11 @@
 class SchemaValidator
 {
     /**
-     * Map built-in Doctrine DBAL 3 types to PHP types
-     */
-    private const BUILTIN_TYPES_MAP_DBAL3 = [
-        AsciiStringType::class => 'string',
-        BigIntType::class => 'string',
-        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',
-    ];
-
-    /**
-     * Map built-in Doctrine DBAL 4+ types to PHP types
+     * It maps built-in Doctrine types to PHP types
      */
     private const BUILTIN_TYPES_MAP = [
         AsciiStringType::class => 'string',
-        BigIntType::class => 'string|int',
+        BigIntType::class => 'string',
         BooleanType::class => 'bool',
         DecimalType::class => 'string',
         FloatType::class => 'float',
@@ -455,10 +436,6 @@ private function findBuiltInType(Type $type): string|null
     {
         $typeName = $type::class;
 
-        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;
-        }
+        return self::BUILTIN_TYPES_MAP[$typeName] ?? null;
     }
 }
diff --git a/tests/Tests/ORM/Tools/SchemaValidatorTest.php b/tests/Tests/ORM/Tools/SchemaValidatorTest.php
index a153e4e77b6..b7141b0d99d 100644
--- a/tests/Tests/ORM/Tools/SchemaValidatorTest.php
+++ b/tests/Tests/ORM/Tools/SchemaValidatorTest.php
@@ -6,8 +6,6 @@
 
 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;
@@ -32,8 +30,6 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 
-use function method_exists;
-
 class SchemaValidatorTest extends OrmTestCase
 {
     private EntityManagerInterface|null $em = null;
@@ -232,47 +228,6 @@ 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]
@@ -592,39 +547,3 @@ 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;
-}