diff --git a/libs/backends/wavesaudio/waves_dataport.cc b/libs/backends/wavesaudio/waves_dataport.cc
index f97bd97846..9e68dd1a9b 100644
--- a/libs/backends/wavesaudio/waves_dataport.cc
+++ b/libs/backends/wavesaudio/waves_dataport.cc
@@ -17,6 +17,7 @@
 
 */
 
+#include <iostream>
 #include "waves_dataport.h"
 
 using namespace ARDOUR;
diff --git a/libs/backends/wavesaudio/waves_midi_device.cc b/libs/backends/wavesaudio/waves_midi_device.cc
index 0f84c6d262..4adaf09449 100644
--- a/libs/backends/wavesaudio/waves_midi_device.cc
+++ b/libs/backends/wavesaudio/waves_midi_device.cc
@@ -17,6 +17,7 @@
 
 */
 
+#include <iostream>
 #include "waves_midi_device.h"
 #include "waves_midi_event.h"
 
diff --git a/libs/backends/wavesaudio/wavesapi/devicemanager/WCMRNativeAudio.cpp b/libs/backends/wavesaudio/wavesapi/devicemanager/WCMRNativeAudio.cpp
index 642ea22de1..889defe0ad 100644
--- a/libs/backends/wavesaudio/wavesapi/devicemanager/WCMRNativeAudio.cpp
+++ b/libs/backends/wavesaudio/wavesapi/devicemanager/WCMRNativeAudio.cpp
@@ -14,6 +14,7 @@
 #include "WCMRNativeAudio.h"
 #include "MiscUtils/pthread_utils.h"
 #include "MiscUtils/safe_delete.h"
+#include <iostream>
 #include <sstream>
 #include <boost/assign/list_of.hpp>