diff --git a/crates/ruma-client-api/src/r0/backup/create_backup.rs b/crates/ruma-client-api/src/r0/backup/create_backup.rs
index 60499b89..dcc1b51c 100644
--- a/crates/ruma-client-api/src/r0/backup/create_backup.rs
+++ b/crates/ruma-client-api/src/r0/backup/create_backup.rs
@@ -17,7 +17,7 @@ ruma_api! {
 
     request: {
         /// The algorithm used for storing backups.
-        #[serde(flatten)]
+        #[ruma_api(body)]
         pub algorithm: Raw<BackupAlgorithm>,
     }