diff --git a/src/plugins/android/androidservicewidget.h b/src/plugins/android/androidservicewidget.h
index cc30003b655..7a80234e4dd 100644
--- a/src/plugins/android/androidservicewidget.h
+++ b/src/plugins/android/androidservicewidget.h
@@ -29,8 +29,10 @@
 #include <QString>
 #include <QWidget>
 
+QT_BEGIN_NAMESPACE
 class QPushButton;
 class QTableView;
+QT_END_NAMESPACE
 
 namespace Android {
 namespace Internal {
diff --git a/src/plugins/help/filtersettingspage.h b/src/plugins/help/filtersettingspage.h
index 6d98f096d87..469df0d23d2 100644
--- a/src/plugins/help/filtersettingspage.h
+++ b/src/plugins/help/filtersettingspage.h
@@ -32,7 +32,9 @@
 #ifndef HELP_NEW_FILTER_ENGINE
 #include "ui_filtersettingspage.h"
 #else
+QT_BEGIN_NAMESPACE
 class QHelpFilterSettingsWidget;
+QT_END_NAMESPACE
 #endif
 
 namespace Help {