diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index a4833e66f..a0e98f2d6 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -647,8 +647,8 @@ void ImProcFunctions::getAutoExp  (unsigned int* histogram, int histcompr, doubl
 
 	bl = (int)((65535*bl)/awg);
     br = log(65535.0*corr / (awg)) / log(2.0);
-    if (br<0)
-        br = 0;
+    if (br<0) br = 0;
+	if (br>10) br=10;
 }
 	
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
diff --git a/rtgui/tonecurve.cc b/rtgui/tonecurve.cc
index 292c212c9..5da391e66 100644
--- a/rtgui/tonecurve.cc
+++ b/rtgui/tonecurve.cc
@@ -49,7 +49,7 @@ ToneCurve::ToneCurve () : ToolPanel(), expAdd(false),hlcompAdd(false),hlcompthre
   pack_start (*Gtk::manage (new  Gtk::HSeparator()));
 
 //----------- Exposure Compensation ------------------------
-  expcomp   = Gtk::manage (new Adjuster (M("TP_EXPOSURE_EXPCOMP"), -5, 5, 0.01, 0));
+  expcomp   = Gtk::manage (new Adjuster (M("TP_EXPOSURE_EXPCOMP"), -5, 10, 0.01, 0));
   pack_start (*expcomp);
   hlcompr = Gtk::manage (new Adjuster (M("TP_EXPOSURE_COMPRHIGHLIGHTS"), 0, 100, 1, 70));
   pack_start (*hlcompr);