diff --git a/libs/ardour/io.cc b/libs/ardour/io.cc
index dff0990f1a..91cbb1cb67 100644
--- a/libs/ardour/io.cc
+++ b/libs/ardour/io.cc
@@ -368,7 +368,7 @@ IO::deliver_output (vector<Sample *>& bufs, uint32_t nbufs, jack_nframes_t nfram
 		return;
 	}
 	
-	if (_panner->bypassed()) {
+	if (_panner->bypassed() || _panner->empty()) {
 		deliver_output_no_pan (bufs, nbufs, nframes, offset);
 		return;
 	}