diff --git a/Form/Type/PickThirdPartyType.php b/Form/Type/PickThirdPartyType.php
index adccdaef7..98d3e585b 100644
--- a/Form/Type/PickThirdPartyType.php
+++ b/Form/Type/PickThirdPartyType.php
@@ -72,7 +72,7 @@ class PickThirdPartyType extends AbstractType
                     return false;
                 }
                 // return false if one element is not contained in allowed types
-                return count(\array_diff($this->typesManager->getTypes(), $types));
+                return count(\array_diff($types, $this->typesManager->getTypes())) === 0;
             })
             ;