diff --git a/cses/structures.py b/cses/structures.py
index d317d8c..63f1334 100644
--- a/cses/structures.py
+++ b/cses/structures.py
@@ -176,4 +176,4 @@ def __init__(self, args: Sequence[SingleDaySchedule]):
 
     @override
     def __getitem__(self, index: int) -> SingleDaySchedule:
-        return self.data[index - 1]
+        return self.data[index]