diff --git a/src/corelib/platform/wasm/qstdweb_p.h b/src/corelib/platform/wasm/qstdweb_p.h
index 6e17b37e4c0..dc8f6435074 100644
--- a/src/corelib/platform/wasm/qstdweb_p.h
+++ b/src/corelib/platform/wasm/qstdweb_p.h
@@ -19,6 +19,8 @@
 #include <emscripten/val.h>
 #include <cstdint>
 #include <functional>
+#include <QtCore/qglobal.h>
+
 
 QT_BEGIN_NAMESPACE
 
@@ -37,7 +39,7 @@ namespace qstdweb {
     class Uint8Array;
     class EventCallback;
 
-    class ArrayBuffer {
+    class Q_CORE_EXPORT ArrayBuffer {
     public:
         explicit ArrayBuffer(uint32_t size);
         explicit ArrayBuffer(const emscripten::val &arrayBuffer);
@@ -49,7 +51,7 @@ namespace qstdweb {
         emscripten::val m_arrayBuffer = emscripten::val::undefined();
     };
 
-    class Blob {
+    class Q_CORE_EXPORT Blob {
     public:
         explicit Blob(const emscripten::val &blob);
         uint32_t size() const;
@@ -62,7 +64,7 @@ namespace qstdweb {
         emscripten::val m_blob = emscripten::val::undefined();
     };
 
-    class File {
+    class Q_CORE_EXPORT File {
     public:
         File() = default;
         explicit File(const emscripten::val &file);
@@ -79,7 +81,7 @@ namespace qstdweb {
         emscripten::val m_file = emscripten::val::undefined();
     };
 
-    class FileList {
+    class Q_CORE_EXPORT FileList {
     public:
         FileList() = default;
         explicit FileList(const emscripten::val &fileList);
@@ -93,7 +95,7 @@ namespace qstdweb {
         emscripten::val m_fileList = emscripten::val::undefined();
     };
 
-    class FileReader {
+    class Q_CORE_EXPORT FileReader {
     public:
         ArrayBuffer result() const;
         void readAsArrayBuffer(const Blob &blob) const;
@@ -110,7 +112,7 @@ namespace qstdweb {
         std::unique_ptr<EventCallback> m_onAbort;
     };
 
-    class Uint8Array {
+    class Q_CORE_EXPORT Uint8Array {
     public:
         static Uint8Array heap();
         explicit Uint8Array(const emscripten::val &uint8Array);
@@ -134,7 +136,7 @@ namespace qstdweb {
         emscripten::val m_uint8Array = emscripten::val::undefined();
     };
 
-    class EventCallback
+    class Q_CORE_EXPORT EventCallback
     {
     public:
         EventCallback() = default;
diff --git a/src/gui/platform/wasm/qwasmlocalfileaccess_p.h b/src/gui/platform/wasm/qwasmlocalfileaccess_p.h
index 3c7a874a433..eb734637596 100644
--- a/src/gui/platform/wasm/qwasmlocalfileaccess_p.h
+++ b/src/gui/platform/wasm/qwasmlocalfileaccess_p.h
@@ -25,17 +25,17 @@ namespace QWasmLocalFileAccess {
 
 enum FileSelectMode { SingleFile, MultipleFiles };
 
-void openFiles(const std::string &accept, FileSelectMode fileSelectMode,
+Q_CORE_EXPORT void openFiles(const std::string &accept, FileSelectMode fileSelectMode,
     const std::function<void (int fileCount)> &fileDialogClosed,
     const std::function<char *(uint64_t size, const std::string name)> &acceptFile,
     const std::function<void()> &fileDataReady);
 
-void openFile(const std::string &accept,
+Q_CORE_EXPORT void openFile(const std::string &accept,
     const std::function<void (bool fileSelected)> &fileDialogClosed,
     const std::function<char *(uint64_t size, const std::string name)> &acceptFile,
     const std::function<void()> &fileDataReady);
 
-void saveFile(const char *content, size_t size, const std::string &fileNameHint);
+Q_CORE_EXPORT void saveFile(const char *content, size_t size, const std::string &fileNameHint);
 
 } // namespace QWasmLocalFileAccess