diff -rup a/src/plugins/grass/qgsgrassmoduleinput.h b/src/plugins/grass/qgsgrassmoduleinput.h
--- a/src/plugins/grass/qgsgrassmoduleinput.h	2018-05-27 14:42:00.818046215 +0200
+++ b/src/plugins/grass/qgsgrassmoduleinput.h	2018-06-10 17:25:28.632016481 +0200
@@ -23,6 +23,7 @@
 #include <QFileSystemModel>
 #include <QFileSystemWatcher>
 #include <QGroupBox>
+#include <QHeaderView>
 #include <QListView>
 #include <QMap>
 #include <QSortFilterProxyModel>
diff -rup a/src/plugins/grass/qgsgrassregion.h b/src/plugins/grass/qgsgrassregion.h
--- a/src/plugins/grass/qgsgrassregion.h	2018-05-27 14:42:00.822046231 +0200
+++ b/src/plugins/grass/qgsgrassregion.h	2018-06-10 18:13:31.935308056 +0200
@@ -16,6 +16,7 @@
 #ifndef QGSGRASSREGION_H
 #define QGSGRASSREGION_H
 
+#include <QValidator>
 #include "ui_qgsgrassregionbase.h"
 #include "qgscoordinatereferencesystem.h"
 #include "qgscoordinatetransform.h"