diff --git a/solitaire_core/src/game_state.rs b/solitaire_core/src/game_state.rs
index 4691d32..13e39f3 100644
--- a/solitaire_core/src/game_state.rs
+++ b/solitaire_core/src/game_state.rs
@@ -969,7 +969,7 @@ impl GameState {
 
     /// Returns `true` when all four foundation slots each contain a complete A→K sequence.
     pub fn check_win(&self) -> bool {
-        self.session.state().state().is_win()
+        self.session.is_win()
     }
 
     /// Returns `true` when the game can be completed without further player input