diff --git a/src/plugins/platforms/wayland/qwaylandcursor.cpp b/src/plugins/platforms/wayland/qwaylandcursor.cpp
index 6ce2b7bbca4..bd820e28e84 100644
--- a/src/plugins/platforms/wayland/qwaylandcursor.cpp
+++ b/src/plugins/platforms/wayland/qwaylandcursor.cpp
@@ -119,7 +119,7 @@ QSharedPointer<QWaylandBuffer> QWaylandCursor::cursorBitmapImage(const QCursor *
 
     const QImage &img = cursor->pixmap().toImage();
     QSharedPointer<QWaylandShmBuffer> buffer(new QWaylandShmBuffer(mDisplay, img.size(), img.format()));
-    memcpy(buffer->image()->bits(), img.bits(), img.byteCount());
+    memcpy(buffer->image()->bits(), img.bits(), img.sizeInBytes());
     return buffer;
 }
 
diff --git a/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp b/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
index a7bc241651a..a9883c5c642 100644
--- a/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
+++ b/src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
@@ -125,7 +125,7 @@ QWaylandShmBuffer::~QWaylandShmBuffer(void)
 {
     delete mMarginsImage;
     if (mImage.constBits())
-        munmap((void *) mImage.constBits(), mImage.byteCount());
+        munmap((void *) mImage.constBits(), mImage.sizeInBytes());
     if (mShmPool)
         wl_shm_pool_destroy(mShmPool);
 }
@@ -287,10 +287,10 @@ void QWaylandShmBackingStore::resize(const QSize &size)
         buffer = getBuffer(sizeWithMargins);
     }
 
-    int oldSize = mBackBuffer ? mBackBuffer->image()->byteCount() : 0;
+    qssize_t oldSize = mBackBuffer ? mBackBuffer->image()->sizeInBytes() : 0;
     // mBackBuffer may have been deleted here but if so it means its size was different so we wouldn't copy it anyway
-    if (mBackBuffer != buffer && oldSize == buffer->image()->byteCount()) {
-        memcpy(buffer->image()->bits(), mBackBuffer->image()->constBits(), buffer->image()->byteCount());
+    if (mBackBuffer != buffer && oldSize == buffer->image()->sizeInBytes()) {
+        memcpy(buffer->image()->bits(), mBackBuffer->image()->constBits(), buffer->image()->sizeInBytes());
     }
     mBackBuffer = buffer;
     // ensure the new buffer is at the beginning of the list so next time getBuffer() will pick