diff --git a/core/includes/form.inc b/core/includes/form.inc
index 8bdab8b..3771890 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -4183,7 +4183,7 @@ function form_validate_color(&$element, &$form_state) {
     try {
       form_set_value($element, Color::rgbToHex(Color::hexToRgb($value)), $form_state);
     }
-    catch (\InvalidArgumentException $e) {
+    catch (InvalidArgumentException $e) {
       form_error($element, t('%name must be a valid color.', array('%name' => empty($element['#title']) ? $element['#parents'][0] : $element['#title'])));
     }
   }