diff --git a/web/skins/classic/views/js/zone.js b/web/skins/classic/views/js/zone.js
index 67ff28d1d..6282cbf8a 100644
--- a/web/skins/classic/views/js/zone.js
+++ b/web/skins/classic/views/js/zone.js
@@ -202,7 +202,7 @@ function toPercent(field, maxValue) {
       field.value = 100;
     }
   }
-  field.setAttribute('step', 0.01);
+  field.setAttribute('step', 'any');
   field.setAttribute('max', 100);
 }
 
diff --git a/web/skins/classic/views/zone.php b/web/skins/classic/views/zone.php
index 2c41a885c..7a4761a50 100644
--- a/web/skins/classic/views/zone.php
+++ b/web/skins/classic/views/zone.php
@@ -206,7 +206,7 @@ if ( count($other_zones) ) {
                         array('data-on-change'=>'applyZoneUnits', 'id'=>'newZone[Units]')
                         );
                         # Used later for number inputs
-                        $step = $newZone['Units'] == 'Percent' ? ' step="0.01" max="100"' : '';
+                        $step = $newZone['Units'] == 'Percent' ? ' step="any" max="100"' : '';
 ?>
                   </td>
 								</tr>