diff --git a/rtgui/locallabtools.cc b/rtgui/locallabtools.cc
index 7f7ec4fc8..26e6f3cff 100644
--- a/rtgui/locallabtools.cc
+++ b/rtgui/locallabtools.cc
@@ -6215,7 +6215,7 @@ LocallabBlur::LocallabBlur():
     radius(Gtk::manage(new Adjuster(M("TP_LOCALLAB_RADIUS"), MINRAD, MAXRAD, 0.1, 1.5, nullptr, nullptr, &blurSlider2radius, &blurRadius2Slider))),
     strength(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STRENGTH"), 0, 100, 1, 0))),
     grainFrame(Gtk::manage(new Gtk::Frame(M("TP_LOCALLAB_GRAINFRA")))),
-    isogr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_ISOGR"), 400, 6400, 1, 0))),
+    isogr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_ISOGR"), 20, 6400, 1, 400))),
     strengr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_STRENGR"), 0, 100, 1, 0))),
     scalegr(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SCALEGR"), 0, 100, 1, 100))),
     medMethod(Gtk::manage(new MyComboBoxText())),