diff --git a/qt/play_word_mediator.h b/qt/play_word_mediator.h
index 46f0404..0dba2cc 100644
--- a/qt/play_word_mediator.h
+++ b/qt/play_word_mediator.h
@@ -21,6 +21,7 @@
 #ifndef VALIDATORS_H_
 #define VALIDATORS_H_
 
+#include <string>
 #include <QtGui/QValidator>
 
 using std::wstring;
diff --git a/qt/training_widget.cpp b/qt/training_widget.cpp
index 1dafbfa..9974231 100644
--- a/qt/training_widget.cpp
+++ b/qt/training_widget.cpp
@@ -20,6 +20,7 @@
 
 #include <QtGui/QStandardItemModel>
 #include <QtGui/QValidator>
+#include <QtGui/QHeaderView>
 
 #include "training_widget.h"
 #include "qtcommon.h"