diff --git a/thirdparty/qwt-lib/qwt/qwt_null_paintdevice.h b/thirdparty/qwt-lib/qwt/qwt_null_paintdevice.h
index d7f03be..cef492e 100644
--- a/thirdparty/qwt-lib/qwt/qwt_null_paintdevice.h
+++ b/thirdparty/qwt-lib/qwt/qwt_null_paintdevice.h
@@ -13,6 +13,7 @@
 #include "qwt_global.h"
 #include <qpaintdevice.h>
 #include <qpaintengine.h>
+#include <QPainterPath>
 
 /*!
   \brief A null paint device doing nothing
diff --git a/thirdparty/qwt-lib/qwt/qwt_painter.h b/thirdparty/qwt-lib/qwt/qwt_painter.h
index 9609b69..67095a3 100644
--- a/thirdparty/qwt-lib/qwt/qwt_painter.h
+++ b/thirdparty/qwt-lib/qwt/qwt_painter.h
@@ -17,6 +17,7 @@
 #include <qpen.h>
 #include <qline.h>
 #include <qpalette.h>
+#include <QPainterPath>
 
 class QPainter;
 class QBrush;
@@ -31,7 +32,6 @@ class QwtColorMap;
 class QwtInterval;
 
 class QTextDocument;
-class QPainterPath;
 
 /*!
   \brief A collection of QPainter workarounds
diff --git a/thirdparty/qwt-lib/qwt/qwt_painter_command.h b/thirdparty/qwt-lib/qwt/qwt_painter_command.h
index 2da597a..3a85b68 100644
--- a/thirdparty/qwt-lib/qwt/qwt_painter_command.h
+++ b/thirdparty/qwt-lib/qwt/qwt_painter_command.h
@@ -15,8 +15,7 @@
 #include <qpixmap.h>
 #include <qimage.h>
 #include <qpolygon.h>
-
-class QPainterPath;
+#include <QPainterPath>
 
 /*!
   QwtPainterCommand represents the attributes of a paint operation
diff --git a/thirdparty/qwt-lib/qwt/qwt_symbol.h b/thirdparty/qwt-lib/qwt/qwt_symbol.h
index ea16d88..8dc65c3 100644
--- a/thirdparty/qwt-lib/qwt/qwt_symbol.h
+++ b/thirdparty/qwt-lib/qwt/qwt_symbol.h
@@ -12,6 +12,7 @@
 
 #include "qwt_global.h"
 #include <qpolygon.h>
+#include <QPainterPath>
 
 class QPainter;
 class QRect;
@@ -21,7 +22,6 @@ class QPen;
 class QColor;
 class QPointF;
 class QPolygonF;
-class QPainterPath;
 class QPixmap;
 class QByteArray;
 class QwtGraphic;