diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index 0706b212d4..c546a10709 100644
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -776,9 +776,9 @@ DummyAudioBackend::register_system_ports()
 
 	/* midi ports */
 	lr.min = lr.max = l_in + _systemic_input_latency;
-	for (int i = 1; i <= m_ins; ++i) {
+	for (int i = 0; i < m_ins; ++i) {
 		char tmp[64];
-		snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", i);
+		snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", i+1);
 		PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
 		if (!p) return -1;
 		set_latency_range (p, false, lr);