diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,6 +85,8 @@
     add_definitions(-D_WIN32_WINNT=${ver})
 endif()
 
+set(HAVE_QTWEBENGINE_5_10 NOT Qt5WebEngineWidgets_VERSION VERSION_LESS 5.10.0)
+
 # Mandatory: OpenSSL
 find_package(OpenSSL REQUIRED)
 
diff --git a/config.h.cmake b/config.h.cmake
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -9,3 +9,6 @@
 
 /* Disable DBus support */
 #cmakedefine DISABLE_DBUS
+
+/* QtWebEngine is at least version 5.10 */
+#cmakedefine01 HAVE_QTWEBENGINE_5_10
diff --git a/src/lib/webengine/webview.cpp b/src/lib/webengine/webview.cpp
--- a/src/lib/webengine/webview.cpp
+++ b/src/lib/webengine/webview.cpp
@@ -495,7 +495,7 @@
 
 void WebView::savePageAs()
 {
-#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+#if HAVE_QTWEBENGINE_5_10
     page()->runJavaScript(QSL("document.contentType"), WebPage::SafeJsWorld, [this](const QVariant &res) {
         const QSet<QString> webPageTypes = {
             QSL("text/html"),