diff --git a/src/plugins/platforms/wayland/qwaylanddataoffer.cpp b/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
index 35085a7f0d5..0c732c02078 100644
--- a/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
+++ b/src/plugins/platforms/wayland/qwaylanddataoffer.cpp
@@ -135,7 +135,7 @@ QVariant QWaylandMimeData::retrieveData_sys(const QString &mimeType, QVariant::T
     }
 
     int pipefd[2];
-    if (::pipe2(pipefd, O_CLOEXEC|O_NONBLOCK) == -1) {
+    if (qt_safe_pipe(pipefd, O_NONBLOCK) == -1) {
         qWarning("QWaylandMimeData: pipe2() failed");
         return QVariant();
     }
diff --git a/src/plugins/platforms/wayland/qwaylanddataoffer_p.h b/src/plugins/platforms/wayland/qwaylanddataoffer_p.h
index 3e88b8f4ba2..5412400a59e 100644
--- a/src/plugins/platforms/wayland/qwaylanddataoffer_p.h
+++ b/src/plugins/platforms/wayland/qwaylanddataoffer_p.h
@@ -51,7 +51,7 @@
 // We mean it.
 //
 
-#include <QtGui/private/qdnd_p.h>
+#include <QtGui/private/qinternalmimedata_p.h>
 
 #include <QtWaylandClient/private/qtwaylandclientglobal_p.h>
 #include <QtWaylandClient/private/qwayland-wayland.h>
diff --git a/src/plugins/platforms/wayland/qwaylandintegration.cpp b/src/plugins/platforms/wayland/qwaylandintegration.cpp
index a3ae802ffae..e935ef31f5f 100644
--- a/src/plugins/platforms/wayland/qwaylandintegration.cpp
+++ b/src/plugins/platforms/wayland/qwaylandintegration.cpp
@@ -52,7 +52,12 @@
 #include "qwaylandwindowmanagerintegration_p.h"
 #include "qwaylandscreen_p.h"
 
-#include <QtFontDatabaseSupport/private/qgenericunixfontdatabase_p.h>
+#if defined(Q_OS_MACOS)
+#  include <QtFontDatabaseSupport/private/qcoretextfontdatabase_p.h>
+#  include <QtFontDatabaseSupport/private/qfontengine_coretext_p.h>
+#else
+#  include <QtFontDatabaseSupport/private/qgenericunixfontdatabase_p.h>
+#endif
 #include <QtEventDispatcherSupport/private/qgenericunixeventdispatcher_p.h>
 #include <QtThemeSupport/private/qgenericunixthemes_p.h>
 
@@ -118,7 +123,11 @@ public:
 };
 
 QWaylandIntegration::QWaylandIntegration()
+#if defined(Q_OS_MACOS)
+    : mFontDb(new QCoreTextFontDatabaseEngineFactory<QCoreTextFontEngine>)
+#else
     : mFontDb(new QGenericUnixFontDatabase())
+#endif
     , mNativeInterface(new QWaylandNativeInterface(this))
 #if QT_CONFIG(accessibility)
     , mAccessibility(new QPlatformAccessibility())
diff --git a/src/plugins/platforms/wayland/qwaylandwindow.cpp b/src/plugins/platforms/wayland/qwaylandwindow.cpp
index ef49e8ea8c8..e071330634f 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindow.cpp
@@ -282,7 +282,18 @@ void QWaylandWindow::setWindowTitle(const QString &title)
 {
     if (mShellSurface) {
         const QString separator = QString::fromUtf8(" \xe2\x80\x94 "); // unicode character U+2014, EM DASH
-        mShellSurface->setTitle(formatWindowTitle(title, separator));
+        const QString formatted = formatWindowTitle(title, separator);
+
+        const int libwaylandMaxBufferSize = 4096;
+        // Some parts of the buffer is used for metadata, so subtract 100 to be on the safe side
+        const int maxLength = libwaylandMaxBufferSize - 100;
+
+        auto truncated = QStringRef(&formatted).left(maxLength);
+        if (truncated.length() < formatted.length()) {
+            qCWarning(lcQpaWayland) << "Window titles longer than" << maxLength << "characters are not supported."
+                                    << "Truncating window title (from" << formatted.length() << "chars)";
+        }
+        mShellSurface->setTitle(truncated.toString());
     }
 
     if (mWindowDecoration && window()->isVisible())
diff --git a/tests/auto/wayland/client/tst_client.cpp b/tests/auto/wayland/client/tst_client.cpp
index 21f748ecd4f..6b7daecd5f1 100644
--- a/tests/auto/wayland/client/tst_client.cpp
+++ b/tests/auto/wayland/client/tst_client.cpp
@@ -162,6 +162,7 @@ public slots:
         // make sure the surfaces from the last test are properly cleaned up
         // and don't show up as false positives in the next test
         QTRY_VERIFY(!compositor->surface());
+        QTRY_VERIFY(!compositor->iviSurface());
         QTRY_VERIFY(!compositor->xdgToplevelV6());
     }
 
@@ -181,6 +182,7 @@ private slots:
     void hiddenTransientParent();
     void hiddenPopupParent();
     void glWindow();
+    void longWindowTitle();
 
 private:
     MockCompositor *compositor = nullptr;
@@ -597,6 +599,16 @@ void tst_WaylandClient::glWindow()
     QTRY_VERIFY(!compositor->surface());
 }
 
+void tst_WaylandClient::longWindowTitle()
+{
+    // See QTBUG-68715
+    QWindow window;
+    QString absurdlyLongTitle(10000, QLatin1Char('z'));
+    window.setTitle(absurdlyLongTitle);
+    window.show();
+    QTRY_VERIFY(compositor->surface());
+}
+
 int main(int argc, char **argv)
 {
     setenv("XDG_RUNTIME_DIR", ".", 1);