diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
index 55fc340d8d..ce4d508b8e 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/ORMQueryBuilderLoader.php
@@ -93,6 +93,13 @@ class ORMQueryBuilderLoader implements EntityLoaderInterface
             $values = array_values(array_filter($values, function ($v) {
                 return (string) $v === (string) (int) $v;
             }));
+        } elseif ('guid' === $metadata->getTypeOfField($identifier)) {
+            $parameterType = Connection::PARAM_STR_ARRAY;
+
+            // Like above, but we just filter out empty strings.
+            $values = array_values(array_filter($values, function ($v) {
+                return (string) $v !== '';
+            }));
         } else {
             $parameterType = Connection::PARAM_STR_ARRAY;
         }