diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index c16b962f34..1eb92c68aa 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -597,7 +597,7 @@ Route::passthru (BufferSet& bufs, framepos_t start_frame, framepos_t end_frame,
 void
 Route::passthru_silence (framepos_t start_frame, framepos_t end_frame, pframes_t nframes, int declick)
 {
-	BufferSet& bufs (_session.get_scratch_buffers (n_process_buffers()));
+	BufferSet& bufs (_session.get_silent_buffers (n_process_buffers()));
 
 	bufs.set_count (_input->n_ports());
 	write_out_of_band_data (bufs, start_frame, end_frame, nframes);