diff --git a/rtengine/improccoordinator.cc b/rtengine/improccoordinator.cc
index aebfe2632..48342087b 100644
--- a/rtengine/improccoordinator.cc
+++ b/rtengine/improccoordinator.cc
@@ -838,7 +838,7 @@ void ImProcCoordinator::updatePreviewImage (int todo, Crop* cropCall)
                         int t_invers = 0;
                         int t_Smeth = 0;
                         int t_currentspot = 1;
-                        int t_radius = 0;
+                        int t_radius = 1;
                         int t_strength = 0;
                         int t_sensibn = 60;
                         int t_inversrad = 0;
@@ -1483,7 +1483,7 @@ void ImProcCoordinator::updatePreviewImage (int todo, Crop* cropCall)
                     int t_invers = 0;
                     int t_Smeth = 0;
                     int t_currentspot = 1;
-                    int t_radius = 0;
+                    int t_radius = 1;
                     int t_strength = 0;
                     int t_sensibn = 60;
                     int t_inversrad = 0;
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index 1b26a22dc..d37b3ab89 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -3766,12 +3766,12 @@ void ImProcFunctions::Lab_Local (int call, int sp, float** shbuffer, LabImage *
 
 //Blur and noise
 
-//printf("rad=%f gaus=%f\n", radius, GAUSS_SKIP);
         if (((radius >= 1.5 * GAUSS_SKIP && lp.rad > 1.) || lp.stren > 0.1)  && lp.blurena) { // radius < GAUSS_SKIP means no gauss, just copy of original image
             LabImage *tmp1;
             LabImage *bufgb;
             int GW = transformed->W;
             int GH = transformed->H;
+            printf ("rad=%f gaus=%f call=%i skip=%i\n", radius, GAUSS_SKIP, call, sk);
 
             if (call == 2  && !lp.invrad) { //simpleprocess
                 int bfh = int (lp.ly + lp.lyT) + del; //bfw bfh real size of square zone
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 6262cb434..849992f47 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -916,7 +916,7 @@ void LocallabParams::setDefaults()
     invers = false;
     curvactiv = false;
     activlum = false;
-    radius = 0;
+    radius = 1;
     inversrad = false;
     inversret = false;
     inverssha = false;
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 547bc5c74..135241310 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -68,7 +68,7 @@ Locallab::Locallab ():
     contrast (Gtk::manage (new Adjuster (M ("TP_LOCALLAB_CONTRAST"), -100, 100, 1, 0))),
     chroma (Gtk::manage (new Adjuster (M ("TP_LOCALLAB_CHROMA"), -100, 150, 1, 0))),
     sensi (Gtk::manage (new Adjuster (M ("TP_LOCALLAB_SENSI"), 0, 100, 1, 19))),
-    radius (Gtk::manage ( new Adjuster (M ("TP_LOCALLAB_RADIUS"), 0, 100, 1, 0) )),
+    radius (Gtk::manage ( new Adjuster (M ("TP_LOCALLAB_RADIUS"), 1, 100, 1, 1) )),
     strength (Gtk::manage ( new Adjuster (M ("TP_LOCALLAB_STRENGTH"), 0, 100, 1, 0) )),
     sensibn (Gtk::manage (new Adjuster (M ("TP_LOCALLAB_SENSIBN"), 0, 100, 1, 60))),
     transit (Gtk::manage (new Adjuster (M ("TP_LOCALLAB_TRANSIT"), 5, 95, 1, 60))),