diff --git a/frontend/src/tools/drawing/ChairTool.ts b/frontend/src/tools/drawing/ChairTool.ts
index 6d5d513..c2073ea 100644
--- a/frontend/src/tools/drawing/ChairTool.ts
+++ b/frontend/src/tools/drawing/ChairTool.ts
@@ -16,7 +16,7 @@ class ChairTool extends Tool {
     const y = event.clientY - this.height / 2;
     
     this.yjsDoc.createElement({
-      id: Date.now().toString(),
+      id: crypto.randomUUID(),
       type: 'chair',
       layerId: 'default',
       x,