diff --git a/config/services.xml b/config/services.xml
index dce5603..a02c4ee 100644
--- a/config/services.xml
+++ b/config/services.xml
@@ -12,7 +12,7 @@
             <tag name="kernel.event_listener" event="kernel.exception" method="onKernelException" priority="-5" />
         </service>
         <service id="Phpro\ApiProblemBundle\Transformer\Chain" class="Phpro\ApiProblemBundle\Transformer\Chain">
-            <argument type="tagged" tag="phpro.api_problem.exception_transformer" />
+            <argument type="tagged_iterator" tag="phpro.api_problem.exception_transformer" />
         </service>
         <service id="Phpro\ApiProblemBundle\Transformer\ApiProblemExceptionTransformer" class="Phpro\ApiProblemBundle\Transformer\ApiProblemExceptionTransformer">
             <tag name="phpro.api_problem.exception_transformer" />