diff --git a/tcl/drivers/nvstep.tcl b/tcl/drivers/nvstep.tcl
index c257f67..f8d191a 100644
--- a/tcl/drivers/nvstep.tcl
+++ b/tcl/drivers/nvstep.tcl
@@ -330,22 +330,14 @@ proc nvstep::updateflow {value} {
   }
   sct filtered $flow
   if {$source eq "flow"} {
-    if {$flow < 1} {
-      # avoid negative flow values, but it smooth]
-      set flow [expr exp($flow - 1)]
-    }
     updateval [sct nvpath]/flow $flow
-  } elseif {$source eq "pressure" {
+  } elseif {$source eq "pressure"} {
     if {$flow < -50} {
       set flow -62.5
     } else {
       set off [hval [sct nvpath]/calib/mbar_offset]
       set fpm [hval [sct nvpath]/calib/ln_per_min_per_mbar]
       set flow [expr ($flow - $off) * $fpm]
-      if {$flow < 1} {
-        # avoid negative flow values, but keep it smooth]
-        set flow [expr exp($flow - 1)]
-      }
     }
     updateval_e [sct nvpath]/flowp $flow -62.5 no_sensor
   } else {