diff --git a/scripts/uosc/elements/Controls.lua b/scripts/uosc/elements/Controls.lua
index 6e97742..1abad69 100644
--- a/scripts/uosc/elements/Controls.lua
+++ b/scripts/uosc/elements/Controls.lua
@@ -325,5 +325,6 @@ function Controls:on_dispositions() self:reflow() end
 function Controls:on_display() self:update_dimensions() end
 function Controls:on_prop_border() self:update_dimensions() end
 function Controls:on_prop_fullormaxed() self:update_dimensions() end
+function Controls:on_timeline_enabled() self:update_dimensions() end
 
 return Controls
diff --git a/scripts/uosc/elements/Timeline.lua b/scripts/uosc/elements/Timeline.lua
index 491e9f3..4af64d1 100644
--- a/scripts/uosc/elements/Timeline.lua
+++ b/scripts/uosc/elements/Timeline.lua
@@ -24,7 +24,9 @@ function Timeline:get_visibility()
 end
 
 function Timeline:decide_enabled()
-	self.enabled = not self.obstructed and state.duration and state.duration > 0 and state.time
+	local previous = self.enabled
+	self.enabled = not self.obstructed and state.duration ~= nil and state.duration > 0 and state.time ~= nil
+	if self.enabled ~= previous then Elements:trigger('timeline_enabled', self.enabled) end
 end
 
 function Timeline:get_effective_size_min()