diff --git a/src/moves.rs b/src/moves.rs
index ebf416c..6166f5c 100644
--- a/src/moves.rs
+++ b/src/moves.rs
@@ -187,10 +187,12 @@ impl<'l> Move<'l> {
                 let pos = self.make();
                 let mut moves = MateMoveGenImpl::new();
                 pos.generate_moves(&mut moves);
-                moves.is_check.then(|| match moves.is_mate {
-                    true => SanSuffix::Checkmate,
-                    false => SanSuffix::Check,
-                })
+                let MateMoveGenImpl { is_check, is_mate } = moves;
+                match (is_check, is_mate) {
+                    (false, _) => None,
+                    (true, false) => Some(SanSuffix::Check),
+                    (true, true) => Some(SanSuffix::Checkmate),
+                }
             },
         }
     }