diff --git a/src/client/hud/layers/GameRightSidebar.ts b/src/client/hud/layers/GameRightSidebar.ts
index 88472d718..12bc818fe 100644
--- a/src/client/hud/layers/GameRightSidebar.ts
+++ b/src/client/hud/layers/GameRightSidebar.ts
@@ -112,6 +112,16 @@ export class GameRightSidebar extends LitElement implements Controller {
     }
 
     if (this.game.inSpawnPhase()) {
+      // Singleplayer has no spawn timer (SpawnTimerExecution isn't added), so
+      // the spawn phase doesn't count down — keep the old static display.
+      if (this.game.config().gameConfig().gameType === GameType.Singleplayer) {
+        const maxTimerValue = this.game.config().gameConfig().maxTimerValue;
+        this.timer =
+          maxTimerValue !== null && maxTimerValue !== undefined
+            ? maxTimerValue * 60
+            : 0;
+        return;
+      }
       const spawnPhaseDurationTicks = this.game.config().numSpawnPhaseTurns();
       const currentTicks = this.game.ticks();
       const remainingTicks = spawnPhaseDurationTicks - currentTicks;