diff --git a/src/DataDefinitionsBundle/Interpreter/DefinitionInterpreter.php b/src/DataDefinitionsBundle/Interpreter/DefinitionInterpreter.php
index 8fc02a2c..b9fd55f2 100644
--- a/src/DataDefinitionsBundle/Interpreter/DefinitionInterpreter.php
+++ b/src/DataDefinitionsBundle/Interpreter/DefinitionInterpreter.php
@@ -34,7 +34,7 @@ public function __construct(RepositoryInterface $definitionRepository, ImporterI
     }
 
     public function interpret(InterpreterContextInterface $context): mixed {
-        $subDefinition = $this->definitionRepository->find($context->getConfiguration()['definition']);
+        $subDefinition = $this->definitionRepository->find((string)$context->getConfiguration()['definition']);
 
         if (!$subDefinition instanceof ImportDefinitionInterface) {
             return null;