diff --git a/sources/instruments/curvelineinstrument.h b/sources/instruments/curvelineinstrument.h
index db2af2d..b40a3f7 100644
--- a/sources/instruments/curvelineinstrument.h
+++ b/sources/instruments/curvelineinstrument.h
@@ -31,6 +31,8 @@
 #include <QtCore/QObject>
 #include <QtCore/QPoint>
 
+#include <QPainterPath>
+
 class CurveLineInstrument : public AbstractInstrument
 {
     Q_OBJECT