diff --git a/claude_desktop_config.json b/claude_desktop_config.json
index 704da2e..b2c9611 100644
--- a/claude_desktop_config.json
+++ b/claude_desktop_config.json
@@ -5,7 +5,7 @@
       "args": ["run", "python", "-m", "breathe_hr_mcp"],
       "env": {
         "BREATHE_HR_API_KEY": "your_breathe_hr_api_key_here",
-        "USE_SANDBOX_URL": false
+        "USE_SANDBOX_URL": "false"
       }
     }
   }