diff --git a/eZ/Bundle/EzPublishCoreBundle/Resources/config/papi.yml b/eZ/Bundle/EzPublishCoreBundle/Resources/config/papi.yml
index 40d8836231e..89a8ef4f750 100644
--- a/eZ/Bundle/EzPublishCoreBundle/Resources/config/papi.yml
+++ b/eZ/Bundle/EzPublishCoreBundle/Resources/config/papi.yml
@@ -58,4 +58,4 @@ services:
         class: %ezpublish.signalslot.event_converter_slot.class%
         arguments: [@event_dispatcher]
         tags:
-            - { name: ezpublish.api.slot, signal: * }
+            - { name: ezpublish.api.slot, signal: '*' }