diff --git a/src/frontends/qt/Toolbars.cpp b/src/frontends/qt/Toolbars.cpp
index a22c5aa589..551fe24854 100644
--- a/src/frontends/qt/Toolbars.cpp
+++ b/src/frontends/qt/Toolbars.cpp
@@ -16,6 +16,8 @@
 #include "Format.h"
 #include "FuncRequest.h"
 #include "LyXAction.h"
+
+#include <QString>
 #include "qt_helpers.h"
 
 #include "support/debug.h"
diff --git a/src/frontends/qt/qt_helpers.cpp b/src/frontends/qt/qt_helpers.cpp
index 713753a773..bdd0e40b26 100644
--- a/src/frontends/qt/qt_helpers.cpp
+++ b/src/frontends/qt/qt_helpers.cpp
@@ -12,6 +12,7 @@
 
 #include <config.h>
 
+#include <QString>
 #include "qt_helpers.h"
 
 #include "Buffer.h"
diff --git a/src/frontends/qt/qt_helpers.h b/src/frontends/qt/qt_helpers.h
index d3ffb5b75f..b8eb11c7e5 100644
--- a/src/frontends/qt/qt_helpers.h
+++ b/src/frontends/qt/qt_helpers.h
@@ -21,8 +21,6 @@
 
 #include <list>
 
-#include <QString>
-
 class QComboBox;
 class QLineEdit;
 class QString;