diff --git a/autotests/extractorcollectiontest.cpp b/autotests/extractorcollectiontest.cpp
--- a/autotests/extractorcollectiontest.cpp
+++ b/autotests/extractorcollectiontest.cpp
@@ -104,9 +104,16 @@
 
             // Verify properties for every supported mimetype
             auto propMimetypesJson = exProperties["MimeTypes"];
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
             QSet<QString> propMimetypes = propMimetypesJson.toMap().keys().toSet();
             QSet<QString> supportedMimetypes = extractor->mimetypes().toSet();
+#else
+            const QStringList propMimeList = propMimetypesJson.toMap().keys();
+            QSet<QString> propMimetypes(propMimeList.begin(), propMimeList.end());
 
+            const QStringList extractedMimes = extractor->mimetypes();
+            QSet<QString> supportedMimetypes(extractedMimes.begin(), extractedMimes.end());
+#endif
             QVERIFY2(!exProperties["Name"].toString().isEmpty(), "Missing \"Name\" property");
             QVERIFY2(!exProperties["Id"].toString().isEmpty(),   "Missing \"Id\" property");
 
diff --git a/autotests/taglibextractortest.cpp b/autotests/taglibextractortest.cpp
--- a/autotests/taglibextractortest.cpp
+++ b/autotests/taglibextractortest.cpp
@@ -581,8 +581,17 @@
     const auto resultList = extracted.properties();
     const auto resultKeys = resultList.uniqueKeys();
 
-    const auto excessKeys = resultKeys.toSet() - expectedKeys.toSet();
-    const auto missingKeys = expectedKeys.toSet() - resultKeys.toSet();
+#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
+    const QSet<KFileMetaData::Property::Property> resultKeySet = resultKeys.toSet();
+    const QSet<KFileMetaData::Property::Property> expectedKeySet = expectedKeys.toSet();
+#else
+    const QSet<KFileMetaData::Property::Property> resultKeySet(resultKeys.begin(), resultKeys.end());
+    const QSet<KFileMetaData::Property::Property> expectedKeySet(expectedKeys.begin(), expectedKeys.end());
+#endif
+
+    const auto excessKeys = resultKeySet - expectedKeySet;
+    const auto missingKeys = expectedKeySet - resultKeySet;
+
     if (!excessKeys.isEmpty()) {
         const auto propNames =  propertyEnumNames(excessKeys.values()).join(QLatin1String(", "));
         if (failMessage.isEmpty()) {
@@ -598,7 +607,6 @@
     }
     QCOMPARE(resultKeys, expectedKeys);
     if (!failMessage.isEmpty()) {
-        auto excessKeys = resultKeys.toSet() - expectedKeys.toSet();
         const auto message = QStringLiteral("%1: %2")
                 .arg(failMessage)
                 .arg(propertyEnumNames(excessKeys.values()).join(QLatin1String(", ")));