diff --git a/src/di/src/Definition/DefinitionSource.php b/src/di/src/Definition/DefinitionSource.php
index 371053cd7..9f5095851 100644
--- a/src/di/src/Definition/DefinitionSource.php
+++ b/src/di/src/Definition/DefinitionSource.php
@@ -142,7 +142,7 @@ class DefinitionSource implements DefinitionSourceInterface
                 $definitions[$identifier] = $def;
             }
         }
-        return array_filter($definitions);
+        return $definitions;
     }
 
     /**