diff --git a/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php b/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
index 8d0350532d..9a1398681f 100644
--- a/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/DateTimeValidator.php
@@ -57,8 +57,8 @@ class DateTimeValidator extends DateValidator
             return;
         }
 
-        if('+' === substr($constraint->format, -1)) {
-            $errors['warnings'] = array_filter($errors['warnings'], function($warning) {
+        if ('+' === substr($constraint->format, -1)) {
+            $errors['warnings'] = array_filter($errors['warnings'], function ($warning) {
                 return 'Trailing data' !== $warning;
             });
         }