diff --git a/src/matrix-api.c b/src/matrix-api.c
index 017aabe..f7f89f6 100644
--- a/src/matrix-api.c
+++ b/src/matrix-api.c
@@ -1997,7 +1997,7 @@ matrix_api_register_account(MatrixAPI *api,
  *           the account data will be set globally
  * @type: the event type of the account data to set. Custom types
  *        should be namespaced to avoid clashes.
- * @content: the content of the account data
+ * @content: (transfer full): the content of the account data
  * @error: return location for a #GError, or %NULL
  *
  * Set some account data for the client. This config is only visible
@@ -2011,7 +2011,7 @@ matrix_api_set_account_data(MatrixAPI *api,
                             const gchar *user_id,
                             const gchar *room_id,
                             const gchar *type,
-                            const JsonNode *content,
+                            JsonNode *content,
                             GError **error)
 {
     g_return_if_fail(MATRIX_IS_API(api));
diff --git a/src/matrix-api.h b/src/matrix-api.h
index d30cfc9..ae50c3e 100644
--- a/src/matrix-api.h
+++ b/src/matrix-api.h
@@ -435,7 +435,7 @@ struct _MatrixAPIInterface {
                              const gchar *user_id,
                              const gchar *room_id,
                              const gchar *type,
-                             const JsonNode *content,
+                             JsonNode *content,
                              GError **error);
     void (*get_room_tags)(MatrixAPI *api,
                           MatrixAPICallback callback,
@@ -856,7 +856,7 @@ void matrix_api_set_account_data(MatrixAPI *api,
                                  const gchar *user_id,
                                  const gchar *room_id,
                                  const gchar *type,
-                                 const JsonNode *content,
+                                 JsonNode *content,
                                  GError **error);
 void matrix_api_get_room_tags(MatrixAPI *api,
                               MatrixAPICallback callback,