diff --git a/src/plugins/platforms/xcb/qxcbcursor.cpp b/src/plugins/platforms/xcb/qxcbcursor.cpp
index 8f087edc9b5..dc9ed46956f 100644
--- a/src/plugins/platforms/xcb/qxcbcursor.cpp
+++ b/src/plugins/platforms/xcb/qxcbcursor.cpp
@@ -10,6 +10,7 @@
 #include <QtGui/QWindow>
 #include <QtGui/QBitmap>
 #include <QtGui/private/qguiapplication_p.h>
+#include <qpa/qplatformtheme.h>
 
 #if QT_CONFIG(xcb_xlib)
 #include <X11/cursorfont.h>
@@ -288,6 +289,13 @@ QXcbCursor::~QXcbCursor()
         xcb_cursor_context_free(m_cursorContext);
 }
 
+QSize QXcbCursor::size() const
+{
+    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
+        return theme->themeHint(QPlatformTheme::MouseCursorSize).toSize();
+    return QSize(24, 24);
+}
+
 void QXcbCursor::updateContext()
 {
     if (m_cursorContext)
diff --git a/src/plugins/platforms/xcb/qxcbcursor.h b/src/plugins/platforms/xcb/qxcbcursor.h
index 14958f824bc..bf26861e8f3 100644
--- a/src/plugins/platforms/xcb/qxcbcursor.h
+++ b/src/plugins/platforms/xcb/qxcbcursor.h
@@ -48,6 +48,8 @@ public:
     QPoint pos() const override;
     void setPos(const QPoint &pos) override;
 
+    QSize size() const override;
+
     void updateContext();
 
     static void queryPointer(QXcbConnection *c, QXcbVirtualDesktop **virtualDesktop, QPoint *pos, int *keybMask = nullptr);