diff --git a/src/ORM/Rule/ExistsIn.php b/src/ORM/Rule/ExistsIn.php
index cbcdfeb6a0e..17fd9e5f74a 100644
--- a/src/ORM/Rule/ExistsIn.php
+++ b/src/ORM/Rule/ExistsIn.php
@@ -110,9 +110,7 @@ public function __invoke(EntityInterface $entity, array $options)
             return true;
         }
 
-        if ($this->_options['allowPartialNulls'] === true
-            && $this->_checkPartialSchemaNulls($entity, $source) === true
-        ) {
+        if ($this->_options['allowPartialNulls'] && $this->_checkPartialSchemaNulls($entity, $source)) {
             return true;
         }
         if ($this->_fieldsAreNull($entity, $source)) {