diff --git a/CMakeLists.txt b/CMakeLists.txt
index 073d4ad1f23d69c3860c1dcc1389f43b6818e545..f7df1de773ab28de913858f2d4634724ad0c2a96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ project(kio-extras VERSION ${KDE_APPLICATIONS_VERSION})
 include(FeatureSummary)
 
 set(QT_MIN_VERSION "5.5.0")
-set(KF5_MIN_VERSION "5.3.0")
+set(KF5_MIN_VERSION "5.40.0")
 find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS DBus Network Widgets Svg)
 
 find_package(Qt5Test ${QT_MIN_VERSION} CONFIG QUIET)
diff --git a/thumbnail/thumbnail.cpp b/thumbnail/thumbnail.cpp
index 6b25c191628eb30c9f639a90624d6da0c17c4cd7..fceb7f8c1153e442414ab007f1683889a95d69d9 100644
--- a/thumbnail/thumbnail.cpp
+++ b/thumbnail/thumbnail.cpp
@@ -663,14 +663,7 @@ bool ThumbnailProtocol::createSubThumbnail(QImage& thumbnail, const QString& fil
 {
     if (m_enabledPlugins.isEmpty()) {
         const KConfigGroup globalConfig(KSharedConfig::openConfig(), "PreviewSettings");
-#if KIO_VERSION >= QT_VERSION_CHECK(5, 40, 0)
         m_enabledPlugins = globalConfig.readEntry("Plugins", KIO::PreviewJob::defaultPlugins());
-#else
-        // We don't have KF5.40 yet; emulate the behavior of KIO::PreviewJob::defaultPlugins()
-        QStringList defaultPlugins = KIO::PreviewJob::availablePlugins();
-        defaultPlugins.removeAll(QStringLiteral("textthumbnail"));
-        m_enabledPlugins = globalConfig.readEntry("Plugins", defaultPlugins);
-#endif
     }
 
     const QMimeDatabase db;