diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index c94eb65b22..ccbe187ff3 100644
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -182,9 +182,6 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 	static void set_global_ui_contrasting_color (uint32_t c) {
 		_ui_contrasting_color = c;
 	}
-	static void set_global_ui_scale_factor (float s) {
-		_ui_scale_factor = s;
-	}
 	static void set_global_ui_style_boxy (bool yn) {
 		_ui_style_boxy = yn ? 1 : 0;
 	}
@@ -346,7 +343,6 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 	static uint32_t      _ui_background_color;
 	static uint32_t      _ui_foreground_color;
 	static uint32_t      _ui_contrasting_color;
-	static float         _ui_scale_factor;
 	static unsigned long _ui_transient_win_id;
 
 	mutable unsigned _state_version;
diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index d158287192..a8f957b8a0 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -135,7 +135,6 @@ int32_t       LV2Plugin::_ui_style_boxy        = 0;
 uint32_t      LV2Plugin::_ui_background_color  = 0x000000ff; // RGBA
 uint32_t      LV2Plugin::_ui_foreground_color  = 0xffffffff; // RGBA
 uint32_t      LV2Plugin::_ui_contrasting_color = 0x33ff33ff; // RGBA
-float         LV2Plugin::_ui_scale_factor      = 1.0;
 unsigned long LV2Plugin::_ui_transient_win_id  = 0;
 
 class LV2World : boost::noncopyable {
@@ -576,7 +575,7 @@ LV2Plugin::init(const void* c_plugin, samplecnt_t rate)
 		{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/extensions/ui#contrastingColor"),
 		  sizeof(int32_t), atom_Int, &_ui_contrasting_color },
 		{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/extensions/ui#scaleFactor"),
-		  sizeof(float), atom_Float, &_ui_scale_factor },
+		  sizeof(float), atom_Float, &ARDOUR::ui_scale_factor },
 		{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://ardour.org/lv2/theme/#styleBoxy"),
 		  sizeof(int32_t), atom_Bool, &_ui_style_boxy },
 		{ LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://ardour.org/lv2/theme/#styleFlat"),