diff --git a/src/QueryReflection/QuerySimulation.php b/src/QueryReflection/QuerySimulation.php
index db50c6748..28d476359 100644
--- a/src/QueryReflection/QuerySimulation.php
+++ b/src/QueryReflection/QuerySimulation.php
@@ -73,6 +73,11 @@ public static function simulateParamValueType(Type $paramType, bool $preparedPar
             return null;
         }
 
+        // TODO the dateformat should be taken from bound-parameter-types, see https://github.com/staabm/phpstan-dba/pull/342
+        if ($paramType instanceof ObjectType && $paramType->isInstanceOf(\DateTimeInterface::class)->yes()) {
+            return date(self::DATE_FORMAT, 0);
+        }
+
         $stringType = new StringType();
         $isStringableObjectType = $paramType instanceof ObjectType
             && $paramType->isInstanceOf(Stringable::class)->yes();
diff --git a/tests/default/config/.phpstan-dba-mysqli.cache b/tests/default/config/.phpstan-dba-mysqli.cache
index e593823a9..481f30412 100644
--- a/tests/default/config/.phpstan-dba-mysqli.cache
+++ b/tests/default/config/.phpstan-dba-mysqli.cache
@@ -2582,6 +2582,13 @@
         )),
       ),
     ),
+    'SELECT count(*) AS c FROM typemix WHERE c_datetime=:last_dt' => 
+    array (
+      'result' => 
+      array (
+        5 => NULL,
+      ),
+    ),
     'SELECT count(*) FROM typemix WHERE c_date = \'1970-01-01\'' => 
     array (
       'result' => 
diff --git a/tests/default/config/.phpstan-dba-pdo.cache b/tests/default/config/.phpstan-dba-pdo.cache
index e593823a9..481f30412 100644
--- a/tests/default/config/.phpstan-dba-pdo.cache
+++ b/tests/default/config/.phpstan-dba-pdo.cache
@@ -2582,6 +2582,13 @@
         )),
       ),
     ),
+    'SELECT count(*) AS c FROM typemix WHERE c_datetime=:last_dt' => 
+    array (
+      'result' => 
+      array (
+        5 => NULL,
+      ),
+    ),
     'SELECT count(*) FROM typemix WHERE c_date = \'1970-01-01\'' => 
     array (
       'result' => 
diff --git a/tests/default/config/.phpunit-phpstan-dba-mysqli.cache b/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
index 24f5ca5f0..369604c02 100644
--- a/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
+++ b/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
@@ -2870,6 +2870,13 @@
         )),
       ),
     ),
+    'SELECT count(*) AS c FROM typemix WHERE c_datetime=:last_dt' => 
+    array (
+      'result' => 
+      array (
+        5 => NULL,
+      ),
+    ),
     'SELECT count(*) FROM typemix WHERE c_date = \'1970-01-01\'' => 
     array (
       'result' => 
diff --git a/tests/default/config/.phpunit-phpstan-dba-pdo.cache b/tests/default/config/.phpunit-phpstan-dba-pdo.cache
index 7271847bd..0bacc0390 100644
--- a/tests/default/config/.phpunit-phpstan-dba-pdo.cache
+++ b/tests/default/config/.phpunit-phpstan-dba-pdo.cache
@@ -2582,6 +2582,13 @@
         )),
       ),
     ),
+    'SELECT count(*) AS c FROM typemix WHERE c_datetime=:last_dt' => 
+    array (
+      'result' => 
+      array (
+        5 => NULL,
+      ),
+    ),
     'SELECT count(*) FROM typemix WHERE c_date = \'1970-01-01\'' => 
     array (
       'result' => 
diff --git a/tests/default/data/doctrine-dbal.php b/tests/default/data/doctrine-dbal.php
index 37e045e8c..d02eb8825 100644
--- a/tests/default/data/doctrine-dbal.php
+++ b/tests/default/data/doctrine-dbal.php
@@ -4,6 +4,7 @@
 
 use Doctrine\DBAL\Cache\QueryCacheProfile;
 use Doctrine\DBAL\Connection;
+use Doctrine\DBAL\Types\Types;
 use function PHPStan\Testing\assertType;
 use staabm\PHPStanDba\Tests\Fixture\StringableObject;
 
@@ -218,4 +219,13 @@ public function dateParameter(Connection $conn)
         $fetchResult = $conn->fetchOne($query, [date('Y-m-d', strtotime('-3hour'))]);
         assertType('int|false', $fetchResult);
     }
+
+    public function customTypeParameters(Connection $conn)
+    {
+        $result = $conn->executeQuery(
+            'SELECT count(*) AS c FROM typemix WHERE c_datetime=:last_dt',
+            ['dt' => new \DateTime()], ['dt' => Types::DATETIME_MUTABLE]
+        );
+        assertType('Doctrine\DBAL\Result', $result);
+    }
 }