diff --git a/libs/ui/include/psemek/ui/slider.hpp b/libs/ui/include/psemek/ui/slider.hpp
index 0eb28bcf..27fdd8a7 100644
--- a/libs/ui/include/psemek/ui/slider.hpp
+++ b/libs/ui/include/psemek/ui/slider.hpp
@@ -18,7 +18,7 @@ namespace psemek::ui
 		virtual void set_value_range(geom::interval<int> i);
 
 		virtual int value() const { return value_; }
-		virtual void set_value(int v);
+		virtual void set_value(int v, bool notify = true);
 
 		using on_value_changed_callback = std::function<void(int)>;
 
diff --git a/libs/ui/source/slider.cpp b/libs/ui/source/slider.cpp
index 1fd868d9..25adf4f3 100644
--- a/libs/ui/source/slider.cpp
+++ b/libs/ui/source/slider.cpp
@@ -83,13 +83,14 @@ namespace psemek::ui
 		set_value(value_);
 	}
 
-	void slider::set_value(int v)
+	void slider::set_value(int v, bool notify)
 	{
 		v = geom::clamp(v, value_range_);
 		if (value_ != v)
 		{
 			value_ = v;
-			post_value_changed();
+			if (notify)
+				post_value_changed();
 		}
 	}