diff --git a/libs/ardour/ardour/region_fx_plugin.h b/libs/ardour/ardour/region_fx_plugin.h
index babe655c61..34f795d353 100644
--- a/libs/ardour/ardour/region_fx_plugin.h
+++ b/libs/ardour/ardour/region_fx_plugin.h
@@ -137,6 +137,7 @@ public:
 
 	void truncate_automation_start (timecnt_t);
 	void truncate_automation_end (timepos_t);
+	void x_scale_automation (Temporal::ratio_t);
 
 	bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
 	bool configure_io (ChanCount in, ChanCount out);
diff --git a/libs/ardour/region_fx_plugin.cc b/libs/ardour/region_fx_plugin.cc
index 66453ec97d..59f2d4b4d2 100644
--- a/libs/ardour/region_fx_plugin.cc
+++ b/libs/ardour/region_fx_plugin.cc
@@ -620,6 +620,15 @@ RegionFxPlugin::truncate_automation_end (timepos_t end)
 	}
 }
 
+void
+RegionFxPlugin::x_scale_automation (Temporal::ratio_t r)
+{
+	for (auto const& i : _controls) {
+		std::shared_ptr<AutomationControl> ac = std::dynamic_pointer_cast<AutomationControl> (i.second);
+		ac->alist ()->x_scale (r);
+	}
+}
+
 bool
 RegionFxPlugin::write_immediate_event (Evoral::EventType event_type, size_t size, const uint8_t* buf)
 {