diff --git a/Common/Service/MeterProcessState/Controllers/FinalCheckController.cs b/Common/Service/MeterProcessState/Controllers/FinalCheckController.cs
index 2742f961..7a44967d 100644
--- a/Common/Service/MeterProcessState/Controllers/FinalCheckController.cs
+++ b/Common/Service/MeterProcessState/Controllers/FinalCheckController.cs
@@ -1412,7 +1412,8 @@ namespace Xylem.Common.Service.MeterProcessState.Controllers
                         Array.Resize(ref hexBytes, 2);
                         Array.Reverse(hexBytes);
 
-                        calFactor = Convert.ToUInt16(string.Join(string.Empty, hexBytes), 16);
+                        hexString = string.Join(string.Empty, hexBytes);
+                        calFactor = Convert.ToUInt16(hexString, 16);
                     }
                     catch
                     {