diff --git a/src/frontends/qt4/GuiProgress.cpp b/src/frontends/qt4/GuiProgress.cpp
index c43a96922b..df0f772f5f 100644
--- a/src/frontends/qt4/GuiProgress.cpp
+++ b/src/frontends/qt4/GuiProgress.cpp
@@ -16,6 +16,7 @@
 
 #include "qt_helpers.h"
 
+#include "support/debug.h"
 #include "support/Systemcall.h"
 
 #include <QApplication>