diff --git a/qelectrotech.pro b/qelectrotech.pro
index ff0df6d20..0382ab7bf 100644
--- a/qelectrotech.pro
+++ b/qelectrotech.pro
@@ -100,6 +100,9 @@ TARGET = qelectrotech
 # Ajustement des bibliotheques utilisees lors de l'edition des liens
 unix:QMAKE_LIBS_THREAD -= -lpthread
 
+# Enable C++11
+QMAKE_CXXFLAGS += -std=c++11
+
 # Description de l'installation
 target.path        = $$join(INSTALL_PREFIX,,,$${QET_BINARY_PATH})
 
diff --git a/sources/qetgraphicsitem/masterelement.cpp b/sources/qetgraphicsitem/masterelement.cpp
index e0be5514d..8c9df30fe 100644
--- a/sources/qetgraphicsitem/masterelement.cpp
+++ b/sources/qetgraphicsitem/masterelement.cpp
@@ -29,7 +29,7 @@ MasterElement::MasterElement(const ElementsLocation &location, QGraphicsItem *qg
 	CustomElement(location, qgi, s, state)
 {
 	link_type_ = Master;
-	cri_ = 0;
+	cri_ = nullptr;
 	connect(this, SIGNAL(elementInfoChange(DiagramContext)), this, SLOT(updateLabel()));
 }
 
@@ -93,7 +93,7 @@ void MasterElement::unlinkElement(Element *elmt) {
 		if (linkedElements().isEmpty()) {
 			diagram()->removeItem(cri_);
 			delete cri_;
-			cri_ = 0;
+			cri_ = nullptr;
 		}
 		else {
 			cri_->updateLabel();