diff --git a/api/src/rehearsalhub/routers/sessions.py b/api/src/rehearsalhub/routers/sessions.py
index 2e54b3f..71296e5 100644
--- a/api/src/rehearsalhub/routers/sessions.py
+++ b/api/src/rehearsalhub/routers/sessions.py
@@ -61,9 +61,8 @@ async def get_session_detail(
         SongRead.model_validate(s).model_copy(update={"version_count": len(s.versions)})
         for s in rehearsal.songs
     ]
-    return RehearsalSessionDetail.model_validate(
-        rehearsal,
-        update={"recording_count": len(songs), "songs": songs},
+    return RehearsalSessionDetail.model_validate(rehearsal).model_copy(
+        update={"recording_count": len(songs), "songs": songs}
     )