diff --git a/QtOAuth/private/qabstractoauth_p.h b/QtOAuth/private/qabstractoauth_p.h
index b3ce8cd09941be0ad7a0f6585a096f2666e0b83a..233f3887d06375971c161e00d5604109595dd44f 100644
--- a/QtOAuth/private/qabstractoauth_p.h
+++ b/QtOAuth/private/qabstractoauth_p.h
@@ -77,15 +77,16 @@ public:
     QAbstractOAuthPrivate(QNetworkAccessManager *manager);
     ~QAbstractOAuthPrivate();
 
+    QNetworkAccessManager *networkAccessManager();
     void setStatus(QAbstractOAuth::Status status);
 
     QUrl authorizationUrl;
     QVariantMap extraTokens;
-    QAbstractOAuth::Status status;
+    QAbstractOAuth::Status status = QAbstractOAuth::Status::NotAuthenticated;
     QNetworkAccessManager::Operation operation;
     QScopedPointer<QAbstractOAuthReplyHandler> replyHandler;
     QScopedPointer<QOAuthOobReplyHandler> defaultReplyHandler;
-    QNetworkAccessManager *networkAccessManager;
+    QPointer<QNetworkAccessManager> networkAccessManagerPointer;
     QAbstractOAuth::ModifyParametersFunction modifyParametersFunction;
 
     static QUrlQuery createQuery(const QVariantMap &parameters);
diff --git a/QtOAuth/qabstractoauth.cpp b/QtOAuth/qabstractoauth.cpp
index 6701bd62dddd7790053750ccdd07fc94c601bed8..4b0226dd4ab1cdd1ef70aff003072e058964f5da 100644
--- a/QtOAuth/qabstractoauth.cpp
+++ b/QtOAuth/qabstractoauth.cpp
@@ -58,10 +58,9 @@ QT_BEGIN_NAMESPACE
 Q_DECLARE_METATYPE(QAbstractOAuth::Error)
 
 QAbstractOAuthPrivate::QAbstractOAuthPrivate(QNetworkAccessManager *manager)
-    : status(QAbstractOAuth::Status::NotAuthenticated),
-      replyHandler(nullptr),
+    : replyHandler(nullptr),
       defaultReplyHandler(new QOAuthOobReplyHandler),
-      networkAccessManager(manager)
+      networkAccessManagerPointer(manager)
 {
     Q_ASSERT(manager);
 }
@@ -69,6 +68,14 @@ QAbstractOAuthPrivate::QAbstractOAuthPrivate(QNetworkAccessManager *manager)
 QAbstractOAuthPrivate::~QAbstractOAuthPrivate()
 {}
 
+QNetworkAccessManager *QAbstractOAuthPrivate::networkAccessManager()
+{
+    Q_Q(QAbstractOAuth);
+    if (!networkAccessManagerPointer)
+        networkAccessManagerPointer = new QNetworkAccessManager(q);
+    return networkAccessManagerPointer.data();
+}
+
 void QAbstractOAuthPrivate::setStatus(QAbstractOAuth::Status newStatus)
 {
     Q_Q(QAbstractOAuth);
@@ -104,6 +111,22 @@ QAbstractOAuth::QAbstractOAuth(QAbstractOAuthPrivate &dd, QObject *parent)
 QAbstractOAuth::~QAbstractOAuth()
 {}
 
+QNetworkAccessManager *QAbstractOAuth::networkAccessManager() const
+{
+    Q_D(const QAbstractOAuth);
+    return d->networkAccessManagerPointer.data();
+}
+
+void QAbstractOAuth::setNetworkAccessManager(QNetworkAccessManager *networkAccessManager)
+{
+    Q_D(QAbstractOAuth);
+    if (networkAccessManager != d->networkAccessManagerPointer) {
+        if (d->networkAccessManagerPointer && d->networkAccessManagerPointer->parent() == this)
+            delete d->networkAccessManagerPointer.data();
+        d->networkAccessManagerPointer = networkAccessManager;
+    }
+}
+
 QAbstractOAuth::Status QAbstractOAuth::status() const
 {
     Q_D(const QAbstractOAuth);
diff --git a/QtOAuth/qabstractoauth.h b/QtOAuth/qabstractoauth.h
index 82f69c65a5bbbf55d7304c048eea42a95c56b690..0a3e829ebaa1f4eadc9e31031951436e479b3617 100644
--- a/QtOAuth/qabstractoauth.h
+++ b/QtOAuth/qabstractoauth.h
@@ -106,6 +106,9 @@ public:
 
     virtual ~QAbstractOAuth();
 
+    QNetworkAccessManager *networkAccessManager() const;
+    void setNetworkAccessManager(QNetworkAccessManager *networkAccessManager);
+
     Status status() const;
 
     // Resource Owner Authorization: https://tools.ietf.org/html/rfc5849#section-2.2
diff --git a/QtOAuth/qabstractoauth2.cpp b/QtOAuth/qabstractoauth2.cpp
index b5ec14cbe1813249537c00b40758d66e1c300177..bf0a132f792cbc94ad022c0db3792ab4c2bc0ad8 100644
--- a/QtOAuth/qabstractoauth2.cpp
+++ b/QtOAuth/qabstractoauth2.cpp
@@ -125,7 +125,7 @@ QNetworkReply *QAbstractOAuth2::get(const QNetworkRequest &req, const QVariantMa
     const QString bearer = d->bearerFormat.arg(d->token.key);
     request.setRawHeader("Authorization", bearer.toUtf8());
 
-    return d->networkAccessManager->get(request);
+    return d->networkAccessManager()->get(request);
 }
 
 QNetworkReply *QAbstractOAuth2::post(const QNetworkRequest &req, const QVariantMap &parameters)
@@ -146,7 +146,7 @@ QNetworkReply *QAbstractOAuth2::post(const QNetworkRequest &req, const QVariantM
     const QString bearer = d->bearerFormat.arg(d->token.key);
     request.setRawHeader("Authorization", bearer.toUtf8());
 
-    return d->networkAccessManager->post(request, QByteArray());
+    return d->networkAccessManager()->post(request, QByteArray());
 }
 
 QString QAbstractOAuth2::scope() const
diff --git a/QtOAuth/qoauth1.cpp b/QtOAuth/qoauth1.cpp
index 5a33805a2ad525dfd0c283e8debb6daaad2f3f9a..cfec0d7365961b85bd4e94aff0da77055e88792b 100644
--- a/QtOAuth/qoauth1.cpp
+++ b/QtOAuth/qoauth1.cpp
@@ -74,10 +74,10 @@ const QString String::oauthVersion =            QStringLiteral("oauth_version");
 static auto networkReplyErrorFunctionPointer = static_cast<void(QNetworkReply::*)(
             QNetworkReply::NetworkError)>(&QNetworkReply::error);
 
-QOAuth1Private::QOAuth1Private(QNetworkAccessManager *manager)
-    : QAbstractOAuthPrivate(manager)
+QOAuth1Private::QOAuth1Private(QNetworkAccessManager *networkAccessManager)
+    : QAbstractOAuthPrivate(networkAccessManager)
 {
-    Q_ASSERT(manager);
+    Q_ASSERT(networkAccessManager);
     qRegisterMetaType<QOAuth1::Credential>("QOAuth1::Credential");
     qRegisterMetaType<QNetworkReply::NetworkError>("QNetworkReply::NetworkError");
 }
@@ -196,7 +196,7 @@ QNetworkReply *QOAuth1Private::requestToken(QNetworkAccessManager::Operation ope
     Q_Q(QOAuth1);
     typedef OAuth1KeyString Key;
 
-    Q_ASSERT(networkAccessManager);
+    Q_ASSERT(networkAccessManager());
     Q_ASSERT(operation == QNetworkAccessManager::GetOperation ||
              operation == QNetworkAccessManager::PostOperation);
 
@@ -222,14 +222,14 @@ QNetworkReply *QOAuth1Private::requestToken(QNetworkAccessManager::Operation ope
             url.setQuery(QOAuth1Private::createQuery(parameters));
             request.setUrl(url);
         }
-        reply = networkAccessManager->get(request);
+        reply = networkAccessManager()->get(request);
     }
     else if (operation == QNetworkAccessManager::PostOperation) {
         QUrlQuery query = QOAuth1Private::createQuery(parameters);
         const QByteArray data = query.toString(QUrl::PrettyDecoded).toUtf8();
         request.setHeader(QNetworkRequest::ContentTypeHeader,
                           QStringLiteral("application/x-www-form-urlencoded"));
-        reply = networkAccessManager->post(request, data);
+        reply = networkAccessManager()->post(request, data);
     }
 
     connect(reply, networkReplyErrorFunctionPointer, this, &QOAuth1Private::_q_onTokenRequestError);
@@ -390,13 +390,13 @@ QNetworkReply *QOAuth1::get(const QNetworkRequest &req, const QVariantMap &param
 
     allParameters.unite(parameters);
     setup(&request, parameters, QNetworkAccessManager::GetOperation);
-    return d->networkAccessManager->get(request);
+    return d->networkAccessManager()->get(request);
 }
 
 QNetworkReply *QOAuth1::post(const QNetworkRequest &req, const QVariantMap &parameters)
 {
     Q_D(QOAuth1);
-    if (!d->networkAccessManager) {
+    if (!d->networkAccessManager()) {
         qCritical("QNetworkAccessManager not available");
         return nullptr;
     }
@@ -410,7 +410,7 @@ QNetworkReply *QOAuth1::post(const QNetworkRequest &req, const QVariantMap &para
     for (auto it = parameters.begin(), end = parameters.end(); it != end; ++it)
         query.addQueryItem(it.key(), it.value().toString());
     QString data = query.toString(QUrl::FullyEncoded);
-    return d->networkAccessManager->post(request, data.toUtf8());
+    return d->networkAccessManager()->post(request, data.toUtf8());
 }
 
 QNetworkReply *QOAuth1::requestTemporaryCredentials(QNetworkAccessManager::Operation operation,
@@ -418,7 +418,7 @@ QNetworkReply *QOAuth1::requestTemporaryCredentials(QNetworkAccessManager::Opera
                                      const QVariantMap &parameters)
 {
     Q_D(QOAuth1);
-    if (Q_UNLIKELY(!d->networkAccessManager)) {
+    if (Q_UNLIKELY(!d->networkAccessManager())) {
         qCritical("QNetworkAccessManager not available");
         return nullptr;
     }
@@ -441,7 +441,7 @@ QNetworkReply *QOAuth1::requestTokenCredentials(QNetworkAccessManager::Operation
                                      const QVariantMap &parameters)
 {
     Q_D(QOAuth1);
-    if (!d->networkAccessManager) {
+    if (!d->networkAccessManager()) {
         qCritical("QNetworkAccessManager not available");
         return nullptr;
     }
diff --git a/QtOAuth/qoauth2authorizationcodeflow.cpp b/QtOAuth/qoauth2authorizationcodeflow.cpp
index 6699dd99e3bb3d68200a0f1b60915e704ff0354d..33e9eca19130520fd88b0dd9ef1a79f454b28c9d 100644
--- a/QtOAuth/qoauth2authorizationcodeflow.cpp
+++ b/QtOAuth/qoauth2authorizationcodeflow.cpp
@@ -160,8 +160,6 @@ QOAuth2AuthorizationCodeFlow::QOAuth2AuthorizationCodeFlow(QNetworkAccessManager
                                                            QObject *parent)
     : QAbstractOAuth2(*new QOAuth2AuthorizationCodeFlowPrivate(manager, port), parent)
 {
-    Q_D(QOAuth2AuthorizationCodeFlow);
-    d->networkAccessManager = manager;
 }
 
 QOAuth2AuthorizationCodeFlow::QOAuth2AuthorizationCodeFlow(const QString &consumerKey,
@@ -171,7 +169,6 @@ QOAuth2AuthorizationCodeFlow::QOAuth2AuthorizationCodeFlow(const QString &consum
     : QAbstractOAuth2(*new QOAuth2AuthorizationCodeFlowPrivate(manager, port), parent)
 {
     Q_D(QOAuth2AuthorizationCodeFlow);
-    d->networkAccessManager = manager;
     d->consumer = consumerKey;
 }
 
@@ -196,7 +193,6 @@ QOAuth2AuthorizationCodeFlow::QOAuth2AuthorizationCodeFlow(const QString &consum
     : QAbstractOAuth2(*new QOAuth2AuthorizationCodeFlowPrivate(manager, port), parent)
 {
     Q_D(QOAuth2AuthorizationCodeFlow);
-    d->networkAccessManager = manager;
     d->authorizationUrl = authenticateUrl;
     d->accessTokenUrl = accessTokenUrl;
     d->consumer = consumerKey;
@@ -289,10 +285,11 @@ void QOAuth2AuthorizationCodeFlow::requestAccessToken(const QString &code)
                       QStringLiteral("application/x-www-form-urlencoded"));
 
     const auto data = query.toString(QUrl::FullyEncoded);
-    d->accessTokenReply = d->networkAccessManager->post(request, data.toUtf8());
-    QObjectPrivate::connect(d->networkAccessManager, &QNetworkAccessManager::finished,
+    d->accessTokenReply = d->networkAccessManager()->post(request, data.toUtf8());
+    QObjectPrivate::connect(d->networkAccessManager(), &QNetworkAccessManager::finished,
                             d, &QOAuth2AuthorizationCodeFlowPrivate::accessTokenRequestFinished);
-    QObjectPrivate::connect(d->networkAccessManager, &QNetworkAccessManager::authenticationRequired,
+    QObjectPrivate::connect(d->networkAccessManager(),
+                            &QNetworkAccessManager::authenticationRequired,
                             d, &QOAuth2AuthorizationCodeFlowPrivate::authenticate,
                             Qt::UniqueConnection);
 }
diff --git a/QtOAuth/qoauth2implicitgrantflow.cpp b/QtOAuth/qoauth2implicitgrantflow.cpp
index c91eafb9782b1ac1b8f1f1509b644c32d1c435ed..3f607b496d07c78bb3dec92f8d35864e8d8c1084 100644
--- a/QtOAuth/qoauth2implicitgrantflow.cpp
+++ b/QtOAuth/qoauth2implicitgrantflow.cpp
@@ -63,8 +63,6 @@ QOAuth2ImplicitGrantFlow::QOAuth2ImplicitGrantFlow(QNetworkAccessManager *manage
                                                    QObject *parent)
     : QAbstractOAuth2(*new QOAuth2ImplicitGrantFlowPrivate(manager), parent)
 {
-    Q_D(QOAuth2ImplicitGrantFlow);
-    d->networkAccessManager = manager;
 }
 
 QOAuth2ImplicitGrantFlow::QOAuth2ImplicitGrantFlow(const QString &consumerToken,
@@ -73,7 +71,6 @@ QOAuth2ImplicitGrantFlow::QOAuth2ImplicitGrantFlow(const QString &consumerToken,
     : QAbstractOAuth2(*new QOAuth2ImplicitGrantFlowPrivate(manager), parent)
 {
     Q_D(QOAuth2ImplicitGrantFlow);
-    d->networkAccessManager = manager;
     d->consumer = consumerToken;
 }