diff --git a/src/Gui/QuantitySpinBox.cpp b/src/Gui/QuantitySpinBox.cpp
index 98a2c6dc0..4ec7d2a90 100644
--- a/src/Gui/QuantitySpinBox.cpp
+++ b/src/Gui/QuantitySpinBox.cpp
@@ -23,6 +23,8 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+# include <QLineEdit>
+# include <QFocusEvent>
 #endif
 
 #include "QuantitySpinBox.h"