diff --git a/gpxsee.pro b/gpxsee.pro
index 76be18b7..60cc5f12 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -111,7 +111,8 @@ SOURCES += src/main.cpp \
     src/coordinates.cpp \
     src/kmlparser.cpp \
     src/fitparser.cpp \
-    src/format.cpp
+    src/format.cpp \
+    src/graph.cpp
 RESOURCES += gpxsee.qrc
 TRANSLATIONS = lang/gpxsee_cs.ts
 macx {
diff --git a/src/graph.cpp b/src/graph.cpp
new file mode 100644
index 00000000..8b34aec4
--- /dev/null
+++ b/src/graph.cpp
@@ -0,0 +1,9 @@
+#include "graph.h"
+
+QDebug operator<<(QDebug dbg, const GraphPoint &graphpoint)
+{
+	dbg.nospace() << "GraphPoint(" << graphpoint.s() << ", "
+	  << graphpoint.t() << ", " << graphpoint.y() << ")";
+
+	return dbg.maybeSpace();
+}
diff --git a/src/graph.h b/src/graph.h
index d6880341..76265a1d 100644
--- a/src/graph.h
+++ b/src/graph.h
@@ -2,6 +2,7 @@
 #define GRAPH_H
 
 #include <QVector>
+#include <QDebug>
 #include <cmath>
 
 enum GraphType {Distance, Time};
@@ -27,6 +28,10 @@ private:
 	qreal _y;
 };
 
+Q_DECLARE_TYPEINFO(GraphPoint, Q_PRIMITIVE_TYPE);
+QDebug operator<<(QDebug dbg, const GraphPoint &graphpoint);
+
+
 class Graph : public QVector<GraphPoint>
 {
 public:
@@ -44,6 +49,4 @@ private:
 	bool _time;
 };
 
-Q_DECLARE_TYPEINFO(GraphPoint, Q_PRIMITIVE_TYPE);
-
 #endif // GRAPH_H