diff --git a/tcl/drivers/ccu4flow.tcl b/tcl/drivers/ccu4flow.tcl
index 53189fb..aafd8fa 100644
--- a/tcl/drivers/ccu4flow.tcl
+++ b/tcl/drivers/ccu4flow.tcl
@@ -541,7 +541,7 @@ proc ccu4flow::ctrl {} {
         # force init of reg_hyst state
         sct regstate reg
         setstate reg_hyst
-      } elseif {$dif * [sct dir] <= 0} {
+      } elseif {$dif * [sct dir] <= 0 || abs($dif) < $tol * 0.5} {
         setstate within_tolerance
       } elseif {$now < $lastim + $period} {
         # wait