diff --git a/api/client-server/create_room.yaml b/api/client-server/create_room.yaml
index d1a0e97a..24382660 100644
--- a/api/client-server/create_room.yaml
+++ b/api/client-server/create_room.yaml
@@ -153,7 +153,7 @@ paths:
                     state_key:
                       type: string
                     content:
-                      type: string
+                      type: object
               preset:
                 type: string
                 enum: ["private_chat", "public_chat", "trusted_private_chat"]