diff --git a/tcl/startup/ccu4make.tcl b/tcl/startup/ccu4make.tcl
index 1a12085..1ab1a43 100644
--- a/tcl/startup/ccu4make.tcl
+++ b/tcl/startup/ccu4make.tcl
@@ -41,7 +41,7 @@ proc makeCCU4 {args} {
         set hepump 1
       }
       nvstep {
-        makenv nv nvstep
+        makenv nv -driver nvstep $sensirion
         GraphAdd nv.flow ln/min nv_flow magenta
         GraphAdd nv.autoflow.flowtarget ln/min nv_set green
         if {[silent 0 result instconfig sensirion]} {