diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index 0e6a01c..abcd1c7 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -153,11 +153,11 @@
                      "type": "float",
                      "value": 0,
                      "step": 0.1,
+                     "decimals": 3,
                      "limits": [
                         0,
                         4
                      ],
-                     "siPrefix": true,
                      "suffix": "V",
                      "noUnitEditing": true,
                      "compactHeight": false,