diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index ea13ffc160..25dc4c534a 100644
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -220,6 +220,8 @@ LV2Plugin::init(LV2World& world, SLV2Plugin plugin, framecnt_t rate)
 				// TODO: Multiple UI support
 				_ui = this_ui;
 				break;
+			} else {
+				cerr << name() << " does not support GTK UI\n";
 			}
 		}
 #else