diff --git a/libervia/backend/plugins/plugin_xep_0363.py b/libervia/backend/plugins/plugin_xep_0363.py
index 371cb86c..60be5c60 100644
--- a/libervia/backend/plugins/plugin_xep_0363.py
+++ b/libervia/backend/plugins/plugin_xep_0363.py
@@ -232,7 +232,7 @@ class XEP_0363:
             for name, value in slot.headers:
                 name = name.encode('utf-8')
                 value = value.encode('utf-8')
-                headers[name] = value
+                headers[name] = [value]
 
 
             await self.host.trigger.async_point(