diff --git a/src/Symfony/Component/DomCrawler/Field/InputFormField.php b/src/Symfony/Component/DomCrawler/Field/InputFormField.php
index 090913efa3..1c3c84d721 100644
--- a/src/Symfony/Component/DomCrawler/Field/InputFormField.php
+++ b/src/Symfony/Component/DomCrawler/Field/InputFormField.php
@@ -32,11 +32,12 @@ class InputFormField extends FormField
             throw new \LogicException(sprintf('An InputFormField can only be created from an input or button tag (%s given).', $this->node->nodeName));
         }
 
-        if ('checkbox' === strtolower($this->node->getAttribute('type'))) {
+        $type = strtolower($this->node->getAttribute('type'));
+        if ('checkbox' === $type) {
             throw new \LogicException('Checkboxes should be instances of ChoiceFormField.');
         }
 
-        if ('file' === strtolower($this->node->getAttribute('type'))) {
+        if ('file' === $type) {
             throw new \LogicException('File inputs should be instances of FileFormField.');
         }