diff --git a/src/board.rs b/src/board.rs
index bee1900..e069447 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -140,7 +140,7 @@ impl fmt::Display for Board {
                 write!(
                     f,
                     "{}|",
-                    self.get(i, j).as_ref().map(Piece::symbol).unwrap_or(" ")
+                    self.get(i, j).as_ref().map(Piece::symbol).unwrap_or(' ')
                 )?;
             }
             writeln!(f)?;
diff --git a/src/piece.rs b/src/piece.rs
index e3014c5..9a299af 100644
--- a/src/piece.rs
+++ b/src/piece.rs
@@ -12,10 +12,10 @@ impl Piece {
         }
     }
 
-    pub const fn symbol(&self) -> &'static str {
+    pub const fn symbol(&self) -> char {
         match self {
-            Piece::White => "■",
-            Piece::Black => "□",
+            Piece::White => '■',
+            Piece::Black => '□',
         }
     }