diff --git a/Thermo.Cam.Utils/TCContr.cs b/Thermo.Cam.Utils/TCContr.cs
index dc4db630..cae5b104 100644
--- a/Thermo.Cam.Utils/TCContr.cs
+++ b/Thermo.Cam.Utils/TCContr.cs
@@ -33,7 +33,7 @@ namespace Thermo.Cam.Utils
         protected string dirDataTemp = "";
         protected string dirImgColor = "";
         protected string dirImgOrigi = "";
-        protected DiscoveryHelper DiscoThread;
+        protected static DiscoveryHelper DiscoThread;
         protected string fileColorPath = "";
         protected string fileDataPath = "";
         protected string fileOrigiPath = "";