diff --git a/src/cadencegraphitem.h b/src/cadencegraphitem.h
index a57e0ad5..891d536a 100644
--- a/src/cadencegraphitem.h
+++ b/src/cadencegraphitem.h
@@ -5,6 +5,8 @@
 
 class CadenceGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	CadenceGraphItem(const Graph &graph, QGraphicsItem *parent = 0);
 
diff --git a/src/elevationgraphitem.h b/src/elevationgraphitem.h
index 77e6c710..52831eac 100644
--- a/src/elevationgraphitem.h
+++ b/src/elevationgraphitem.h
@@ -5,6 +5,8 @@
 
 class ElevationGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	ElevationGraphItem(const Graph &graph, QGraphicsItem *parent = 0);
 
diff --git a/src/heartrategraphitem.h b/src/heartrategraphitem.h
index f3941b68..3e74e4cc 100644
--- a/src/heartrategraphitem.h
+++ b/src/heartrategraphitem.h
@@ -5,6 +5,8 @@
 
 class HeartRateGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	HeartRateGraphItem(const Graph &graph, QGraphicsItem *parent = 0);
 
diff --git a/src/powergraphitem.h b/src/powergraphitem.h
index d05edb64..50d68917 100644
--- a/src/powergraphitem.h
+++ b/src/powergraphitem.h
@@ -5,6 +5,8 @@
 
 class PowerGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	PowerGraphItem(const Graph &graph, QGraphicsItem *parent = 0);
 
diff --git a/src/speedgraphitem.h b/src/speedgraphitem.h
index ec3705aa..8a4962a6 100644
--- a/src/speedgraphitem.h
+++ b/src/speedgraphitem.h
@@ -5,6 +5,8 @@
 
 class SpeedGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	SpeedGraphItem(const Graph &graph, qreal movingTime,
 	  QGraphicsItem *parent = 0);
diff --git a/src/temperaturegraphitem.h b/src/temperaturegraphitem.h
index a102b4d5..3cf8b2c6 100644
--- a/src/temperaturegraphitem.h
+++ b/src/temperaturegraphitem.h
@@ -5,6 +5,8 @@
 
 class TemperatureGraphItem : public GraphItem
 {
+	Q_OBJECT
+
 public:
 	TemperatureGraphItem(const Graph &graph, QGraphicsItem *parent = 0);