diff --git a/typo3/sysext/form/Classes/Mvc/Validation/DateRangeValidator.php b/typo3/sysext/form/Classes/Mvc/Validation/DateRangeValidator.php
index d76efa4f42..593e83d947 100644
--- a/typo3/sysext/form/Classes/Mvc/Validation/DateRangeValidator.php
+++ b/typo3/sysext/form/Classes/Mvc/Validation/DateRangeValidator.php
@@ -41,7 +41,7 @@ class DateRangeValidator extends AbstractValidator
      */
     public function isValid($value)
     {
-        $this->validateOptions();
+        $options = $this->validateOptions();
 
         if (!($value instanceof \DateTime)) {
             $this->addError(
@@ -56,9 +56,9 @@ class DateRangeValidator extends AbstractValidator
             return;
         }
 
-        $minimum = $this->options['minimum'];
-        $maximum = $this->options['maximum'];
-        $format = $this->options['format'];
+        $minimum = $options['minimum'];
+        $maximum = $options['maximum'];
+        $format = $options['format'];
         $value->modify('midnight');
 
         if (
@@ -96,9 +96,11 @@ class DateRangeValidator extends AbstractValidator
      * Checks if this validator is correctly configured
      *
      * @throws InvalidValidationOptionsException if the configured validation options are incorrect
+     * @return array
      */
     protected function validateOptions()
     {
+        $options = ['format' => $this->options['format']];
         if (!empty($this->options['minimum'])) {
             $minimum = \DateTime::createFromFormat($this->options['format'], $this->options['minimum']);
             if (!($minimum instanceof \DateTime)) {
@@ -107,7 +109,7 @@ class DateRangeValidator extends AbstractValidator
             }
 
             $minimum->modify('midnight');
-            $this->options['minimum'] = $minimum;
+            $options['minimum'] = $minimum;
         }
 
         if (!empty($this->options['maximum'])) {
@@ -118,7 +120,8 @@ class DateRangeValidator extends AbstractValidator
             }
 
             $maximum->modify('midnight');
-            $this->options['maximum'] = $maximum;
+            $options['maximum'] = $maximum;
         }
+        return $options;
     }
 }