diff --git a/src/axis/barcategoryaxis/qbarcategoryaxis.cpp b/src/axis/barcategoryaxis/qbarcategoryaxis.cpp
index e70fe3a..b61d069 100644
--- a/src/axis/barcategoryaxis/qbarcategoryaxis.cpp
+++ b/src/axis/barcategoryaxis/qbarcategoryaxis.cpp
@@ -199,7 +199,7 @@ void QBarCategoryAxis::remove(const QString &category)
         if(!d->m_categories.isEmpty())
             setRange(d->m_categories.first(),d->m_categories.last());
         else
-            setRange(QString(),QString());
+            setRange(QString::null,QString::null);
         emit categoriesChanged();
     }
 }
@@ -242,7 +242,7 @@ void QBarCategoryAxis::clear()
 {
     Q_D(QBarCategoryAxis);
     d->m_categories.clear();
-    setRange(QString(),QString());
+    setRange(QString::null,QString::null);
     emit categoriesChanged();
 }
 
diff --git a/src/axis/valueaxis/qvalueaxis.cpp b/src/axis/valueaxis/qvalueaxis.cpp
index 266ddf6..9d04784 100644
--- a/src/axis/valueaxis/qvalueaxis.cpp
+++ b/src/axis/valueaxis/qvalueaxis.cpp
@@ -301,7 +301,8 @@ QValueAxisPrivate::QValueAxisPrivate(QValueAxis* q):
     m_min(0),
     m_max(0),
     m_tickCount(5),
-    m_niceNumbers(false)
+    m_niceNumbers(false),
+    m_format(QString::null)
 {
 
 }