diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 43a4901ca7..5194ae6166 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -2775,7 +2775,7 @@ LV2World::LV2World()
 	patch_writable     = lilv_new_uri(world, LV2_PATCH__writable);
 	patch_Message      = lilv_new_uri(world, LV2_PATCH__Message);
 #ifdef LV2_EXTENDED
-	lv2_noSampleAccurateCtrl    = lilv_new_uri(world, LV2_CORE_PREFIX "noSampleAccurateControls");
+	lv2_noSampleAccurateCtrl    = lilv_new_uri(world, "http://ardour.org/lv2/ext#noSampleAccurateControls");
 	auto_can_write_automatation = lilv_new_uri(world, LV2_AUTOMATE_URI__can_write);
 	auto_automation_control     = lilv_new_uri(world, LV2_AUTOMATE_URI__control);
 	auto_automation_controlled  = lilv_new_uri(world, LV2_AUTOMATE_URI__controlled);