diff --git a/rtengine/procparams.h b/rtengine/procparams.h
index b3139cdcb..39be8e33e 100644
--- a/rtengine/procparams.h
+++ b/rtengine/procparams.h
@@ -755,7 +755,7 @@ public:
     {
         enabled = false;
         threshold = 0;
-        amount = 0;
+        amount = 1;
     }
 };
 
diff --git a/rtgui/fattaltonemap.cc b/rtgui/fattaltonemap.cc
index d14b76004..10dba51cf 100644
--- a/rtgui/fattaltonemap.cc
+++ b/rtgui/fattaltonemap.cc
@@ -29,7 +29,7 @@ FattalToneMapping::FattalToneMapping(): FoldableToolPanel(this, "fattal", M("TP_
 
 //    setEnabledTooltipMarkup(M("TP_EPD_TOOLTIP"));
 
-    amount = Gtk::manage(new Adjuster (M("TP_TM_FATTAL_AMOUNT"), 0., 100., 1., 0.0));
+    amount = Gtk::manage(new Adjuster (M("TP_TM_FATTAL_AMOUNT"), 1., 100., 1., 0.0));
     threshold = Gtk::manage(new Adjuster (M("TP_TM_FATTAL_THRESHOLD"), -100., 100., 1., 0.0));
 
     amount->setAdjusterListener(this);