diff --git a/src/Gui/CommandStructure.cpp b/src/Gui/CommandStructure.cpp
index 163cba1b08..a28d4b052a 100644
--- a/src/Gui/CommandStructure.cpp
+++ b/src/Gui/CommandStructure.cpp
@@ -23,6 +23,7 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+#include <QApplication>
 #include <QMessageBox>
 #endif