diff --git a/python_scripts/i2cdirect.py b/python_scripts/i2cdirect.py
index 92382a04162c9a4b3dc1dd7e22cf116ca8ac9613..01bc7a41123ffc1df2f581c754f1301c4f97a11b 100644
--- a/python_scripts/i2cdirect.py
+++ b/python_scripts/i2cdirect.py
@@ -41,7 +41,7 @@ class i2cdirect():
             return None
         var1=self.conf.getvars()[varid]
         drv=var1.get('drivercls');        
-        data2=var2byte(var1,data)
+        data2,mask=var2byte(var1,data)
         return drv.OPCUASetVariable(varid,var1,data2,[])
 
     def SetRegister(self,regname,value):