diff --git a/src/GreenHome.Api/Controllers/TelemetryController.cs b/src/GreenHome.Api/Controllers/TelemetryController.cs
index a8da2e3..c32ac4e 100644
--- a/src/GreenHome.Api/Controllers/TelemetryController.cs
+++ b/src/GreenHome.Api/Controllers/TelemetryController.cs
@@ -25,7 +25,7 @@ public class TelemetryController : ControllerBase
     }
 
     [HttpGet("AddData")]
-    public async Task<ActionResult<int>> Create(object deviceName, decimal temperatureC, decimal humidityPercent, 
+    public async Task<ActionResult<int>> Create(string deviceName, decimal temperatureC, decimal humidityPercent, 
         decimal soilPercent, int gasPPM, decimal lux, CancellationToken cancellationToken)
     {