diff --git a/backend/schemas.py b/backend/schemas.py
index c60d6fc..ed56573 100644
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -201,7 +201,7 @@ class ShowRead(ShowBase):
     slug: Optional[str] = None
     vertical: Optional[VerticalSimple] = None
     venue: Optional[VenueRead] = None
-    tour: Optional[TourRead] = None
+    tour: Optional["TourRead"] = None
     tags: List["TagRead"] = []
     performances: List["PerformanceRead"] = []
     notes: Optional[str] = None