diff --git a/src/timer/backboard.ts b/src/timer/Backboard.ts
similarity index 100%
rename from src/timer/backboard.ts
rename to src/timer/Backboard.ts
diff --git a/src/timer/dial.ts b/src/timer/Dial.ts
similarity index 100%
rename from src/timer/dial.ts
rename to src/timer/Dial.ts
diff --git a/src/timer/numbers.ts b/src/timer/Numbers.ts
similarity index 100%
rename from src/timer/numbers.ts
rename to src/timer/Numbers.ts
diff --git a/src/timer/index.ts b/src/timer/index.ts
index d248dd2..2e39b3c 100644
--- a/src/timer/index.ts
+++ b/src/timer/index.ts
@@ -1,8 +1,8 @@
 import { Unit } from '../_common/type';
 import { unitToMillis } from '../_common/util';
-import BackBoard from './backboard';
-import Dial from './dial';
-import Numbers from './numbers';
+import BackBoard from './BackBoard';
+import Dial from './Dial';
+import Numbers from './Numbers';
 
 interface TimerParams {
   x: number;