diff --git a/apps/client/src/scenes/game/application/GameTimer.ts b/apps/client/src/scenes/game/application/GameTimer.ts
index b31d726..5104d44 100644
--- a/apps/client/src/scenes/game/application/GameTimer.ts
+++ b/apps/client/src/scenes/game/application/GameTimer.ts
@@ -49,7 +49,12 @@
   public getRemainingTime(): number {
     if (!this.gameStartTime) return config.GAME_CONFIG.GAME_DURATION_SEC;
 
-    const elapsedMs = this.nowMsProvider() - this.gameStartTime;
+    const nowMs = this.nowMsProvider();
+    if (nowMs < this.gameStartTime) {
+      return config.GAME_CONFIG.GAME_DURATION_SEC;
+    }
+
+    const elapsedMs = nowMs - this.gameStartTime;
     const remainingSec =
       config.GAME_CONFIG.GAME_DURATION_SEC - elapsedMs / 1000;