diff --git a/examples/includes/menu.php b/examples/includes/menu.php
index <HASH>..<HASH> 100644
--- a/examples/includes/menu.php
+++ b/examples/includes/menu.php
@@ -3,6 +3,7 @@
         <a href="index.php">Basic</a>
         <a href="querystring.php">Query string</a>
         <a href="constraint.php">Disable operator</a>
+        <a href="closure.php">Closure filter</a>
         <a href="collection.php">Doctrine ArrayCollection filter</a>
         <a href="orm.php">Doctrine ORM</a>
         <a href="mongodb.php">Doctrine MongoDb</a>
diff --git a/src/Expr/ClosureExpressionBuilder.php b/src/Expr/ClosureExpressionBuilder.php
index <HASH>..<HASH> 100644
--- a/src/Expr/ClosureExpressionBuilder.php
+++ b/src/Expr/ClosureExpressionBuilder.php
@@ -197,7 +197,7 @@ class ClosureExpressionBuilder implements ExpressionBuilderInterface
     public function contains($field, $value)
     {
         return function ($object) use ($field, $value) {
-            return strpos(ClosureExpressionBuilder::getObjectFieldValue($object, $field), $value);
+            return false !== strpos(ClosureExpressionBuilder::getObjectFieldValue($object, $field), $value);
         };
     }
fix closure contains when string is at position 0