diff --git a/libs/ctrl-interface/midi_surface/midi_surface.cc b/libs/ctrl-interface/midi_surface/midi_surface.cc
index e251225233..1309f4cc55 100644
--- a/libs/ctrl-interface/midi_surface/midi_surface.cc
+++ b/libs/ctrl-interface/midi_surface/midi_surface.cc
@@ -408,7 +408,7 @@ MIDISurface::do_request (MidiSurfaceRequest * req)
 {
 	if (req->type == CallSlot) {
 
-		call_slot (MISSING_INVALIDATOR, req->the_slot);
+		call_slot (PBD::EventLoop::__invalidator (*this, __FILE__, __LINE__), req->the_slot);
 
 	} else if (req->type == Quit) {