diff --git a/src/Doctrine/Odm/Filter/AbstractFilter.php b/src/Doctrine/Odm/Filter/AbstractFilter.php
index 40cecd1400f..d1b30add62a 100644
--- a/src/Doctrine/Odm/Filter/AbstractFilter.php
+++ b/src/Doctrine/Odm/Filter/AbstractFilter.php
@@ -86,7 +86,7 @@ protected function isPropertyEnabled(string $property, string $resourceClass): b
     protected function denormalizePropertyName(string|int $property): string
     {
         if (!$this->nameConverter instanceof NameConverterInterface) {
-            return $property;
+            return (string) $property;
         }
 
         return implode('.', array_map($this->nameConverter->denormalize(...), explode('.', (string) $property)));
diff --git a/src/Doctrine/Orm/Filter/AbstractFilter.php b/src/Doctrine/Orm/Filter/AbstractFilter.php
index c1deb1c0a90..0ad569e5145 100644
--- a/src/Doctrine/Orm/Filter/AbstractFilter.php
+++ b/src/Doctrine/Orm/Filter/AbstractFilter.php
@@ -80,7 +80,7 @@ protected function isPropertyEnabled(string $property, string $resourceClass): b
     protected function denormalizePropertyName(string|int $property): string
     {
         if (!$this->nameConverter instanceof NameConverterInterface) {
-            return $property;
+            return (string) $property;
         }
 
         return implode('.', array_map($this->nameConverter->denormalize(...), explode('.', (string) $property)));