diff --git a/lib/DateTime.php b/lib/DateTime.php
index 581ef35c..56eb809f 100644
--- a/lib/DateTime.php
+++ b/lib/DateTime.php
@@ -24,7 +24,7 @@ private static function createFromRegular(\DateTime $datetime): self
      */
     public static function createFromFormat($format, $time, $timezone = null): self
     {
-        $datetime = parent::createFromFormat($format, $time, $timezone);
+        $datetime = \DateTime::createFromFormat($format, $time, $timezone);
         if ($datetime === false) {
             throw DatetimeException::createFromPhpError();
         }
diff --git a/lib/DateTimeImmutable.php b/lib/DateTimeImmutable.php
index 114ec3a3..3ce8b103 100644
--- a/lib/DateTimeImmutable.php
+++ b/lib/DateTimeImmutable.php
@@ -57,7 +57,7 @@ public function getInnerDateTime(): \DateTimeImmutable
      */
     public static function createFromFormat($format, $time, $timezone = null): self
     {
-        $datetime = parent::createFromFormat($format, $time, $timezone);
+        $datetime = \DateTimeImmutable::createFromFormat($format, $time, $timezone);
         if ($datetime === false) {
             throw DatetimeException::createFromPhpError();
         }