--- a/src/base/Instrument.cpp
+++ b/src/base/Instrument.cpp
@@ -31,6 +31,7 @@
 #include <utility>  // for std::pair
 
 #include <QtGlobal>  // for Q_ASSERT()
+#include <QCoreApplication>
 
 namespace Rosegarden
 {
--- a/src/base/MidiDevice.cpp
+++ b/src/base/MidiDevice.cpp
@@ -32,6 +32,7 @@
 #include <sstream>
 
 #include <QString>
+#include <QCoreApplication>
 
 namespace Rosegarden
 {