diff --git a/src/corelib/platform/wasm/qstdweb_p.h b/src/corelib/platform/wasm/qstdweb_p.h
index 204343baaa..e01a5bd855 100644
--- a/src/corelib/platform/wasm/qstdweb_p.h
+++ b/src/corelib/platform/wasm/qstdweb_p.h
@@ -207,7 +207,7 @@ namespace qstdweb {
     {
     };
 
-    std::shared_ptr<CancellationFlag>
+    Q_CORE_EXPORT std::shared_ptr<CancellationFlag>
     readDataTransfer(emscripten::val webObject, std::function<QVariant(QByteArray)> imageReader,
                      std::function<void(std::unique_ptr<QMimeData>)> onDone);
 }