diff --git a/power_console_common.h b/power_console_common.h
index 1c2c2ea..c4dcdce 100644
--- a/power_console_common.h
+++ b/power_console_common.h
@@ -4,6 +4,7 @@
 #include <Fl/Fl_Window.H>
 #include <Fl/Fl_Value_Slider.H>
 
+#include <iostream>
 
 void saverChosen();
 void perfChosen();
@@ -31,7 +32,13 @@ class MouseWheelSlider : public Fl_Value_Slider
 					// Negative, because I use this for the Brightness control.
 					const int dy= -Fl::event_dy();
 
-					value( value() - dy * step() );
+					const int newVal= value() - dy * step();
+					if( 0 ) std::cerr << "newVal: " << newVal << " max: " << maximum() << " min: " << minimum() << std::endl;
+					if( newVal >= maximum()
+							and newVal <= minimum() )
+					{
+						value( newVal );
+					}
 
 					do_callback();