diff --git a/src/tile_data.rs b/src/tile_data.rs
index 296780a..bd8b825 100644
--- a/src/tile_data.rs
+++ b/src/tile_data.rs
@@ -419,7 +419,7 @@ pub fn tile_data(tile: TileType) -> TileData {
             blink: false,
         },
         TileType::Letter(c) => TileData {
-            glyph: to_cp437(c),
+            glyph: to_cp437(c.to_ascii_uppercase()),
             serialized_char: c,
             color_fg: vga::WHITE_BRIGHT,
             color_bg: vga::YELLOW,