diff --git a/src/core/scheduler_p.h b/src/core/scheduler_p.h
--- a/src/core/scheduler_p.h
+++ b/src/core/scheduler_p.h
@@ -73,7 +73,11 @@
 #ifdef SCHEDULER_DEBUG
     QList<KIO::SimpleJob *> runningJobs() const
     {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
         return m_runningJobs.toList();
+#else
+        return QList<KIO::SimpleJob *>(m_runningJobs.cbegin(), m_runningJobs.cend());
+#endif
     }
 #endif
     bool isJobRunning(KIO::SimpleJob *job) const
diff --git a/src/ioslaves/http/kcookiejar/kcookiejar.cpp b/src/ioslaves/http/kcookiejar/kcookiejar.cpp
--- a/src/ioslaves/http/kcookiejar/kcookiejar.cpp
+++ b/src/ioslaves/http/kcookiejar/kcookiejar.cpp
@@ -311,8 +311,16 @@
 
     KConfig cfg(QStringLiteral("kf5/kcookiejar/domain_info"), KConfig::NoGlobals, QStandardPaths::GenericDataLocation);
     KConfigGroup group(&cfg, QString());
-    m_gTLDs = QSet<QString>::fromList(group.readEntry("gTLDs", QStringList()));
-    m_twoLevelTLD = QSet<QString>::fromList(group.readEntry("twoLevelTLD", QStringList()));
+
+    const QStringList tldList = group.readEntry("gTLDs", QStringList());
+    const QStringList twoLevelTldList = group.readEntry("twoLevelTLD", QStringList());
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    m_gTLDs = QSet<QString>::fromList(tldList);
+    m_twoLevelTLD = QSet<QString>::fromList(twoLevelTldList);
+#else
+    m_gTLDs = QSet<QString>(tldList.begin(), tldList.end());
+    m_twoLevelTLD = QSet<QString>(twoLevelTldList.begin(), twoLevelTldList.end());
+#endif
 }
 
 //
diff --git a/src/urifilters/ikws/ikwsopts.cpp b/src/urifilters/ikws/ikwsopts.cpp
--- a/src/urifilters/ikws/ikwsopts.cpp
+++ b/src/urifilters/ikws/ikwsopts.cpp
@@ -126,7 +126,13 @@
 void ProvidersModel::setFavoriteProviders(const QStringList &favoriteEngines)
 {
     beginResetModel();
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     m_favoriteEngines = QSet<QString>::fromList(favoriteEngines);
+#else
+    m_favoriteEngines = QSet<QString>(favoriteEngines.begin(), favoriteEngines.end());
+#endif
+
     endResetModel();
 }
 
@@ -182,7 +188,11 @@
 
 QStringList ProvidersModel::favoriteEngines() const
 {
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
     return m_favoriteEngines.toList();
+#else
+    return QStringList(m_favoriteEngines.cbegin(), m_favoriteEngines.cend());
+#endif
 }
 
 //END ProvidersModel