diff --git a/src/xfpm-backlight.c b/src/xfpm-backlight.c
index d69c588..0d651bc 100644
--- a/src/xfpm-backlight.c
+++ b/src/xfpm-backlight.c
@@ -102,9 +102,9 @@ xfpm_backlight_dim_brightness (XfpmBacklight *backlight)
 	    return;
 	}
 	
-	dim_level = dim_level * backlight->priv->max_level / 100;
+	dim_level = dim_level * backlight->priv->last_level / 100.0 + 0.5;
 	
-	XFPM_DEBUG ("Current brightness level before dimming : %i, new %i", backlight->priv->last_level, dim_level);
+        XFPM_DEBUG ("Current brightness level before dimming : %i, new %i", backlight->priv->last_level, dim_level);
 	
 	backlight->priv->dimmed = xfpm_brightness_set_level (backlight->priv->brightness, dim_level);
     }