diff --git a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
index 0191e0b2165..dcfc4433e6f 100644
--- a/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
+++ b/src/plugins/platforms/wasm/qwasmoffscreensurface.cpp
@@ -27,4 +27,9 @@ QWasmOffscreenSurface::~QWasmOffscreenSurface()
     emscripten::val::module_property("specialHTMLTargets").delete_(m_specialTargetId);
 }
 
+bool QWasmOffscreenSurface::isValid() const
+{
+    return !m_offscreenCanvas.isNull() && !m_offscreenCanvas.isUndefined();
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmoffscreensurface.h b/src/plugins/platforms/wasm/qwasmoffscreensurface.h
index 38a991f4cee..1c713104481 100644
--- a/src/plugins/platforms/wasm/qwasmoffscreensurface.h
+++ b/src/plugins/platforms/wasm/qwasmoffscreensurface.h
@@ -20,6 +20,7 @@ public:
     ~QWasmOffscreenSurface() final;
 
     const std::string &id() const { return m_specialTargetId; }
+    bool isValid() const override;
 
 private:
     std::string m_specialTargetId;