gistfile1

diff --git a/src/core/api/qwebenginecallback.cpp b/src/core/api/qwebenginecallback.cpp
index adddd37..03d0ffa 100644
--- a/src/core/api/qwebenginecallback.cpp
+++ b/src/core/api/qwebenginecallback.cpp
@@ -136,9 +136,9 @@ void CallbackDirectory::CallbackSharedDataPointer<T>::invokeEmpty()
 
 #define DECLATE_SUPPORTED_CALLBACK_TYPE(T) \
     template struct CallbackDirectory::CallbackSharedDataPointer<T>; \
-    template void CallbackDirectory::invokeInternal<T>(quint64, T); \
+    template void CallbackDirectory::invokeInternal<T>(QT_PREPEND_NAMESPACE(quint64), T); \
     template void CallbackDirectory::invokeEmpty<T>(const QWebEngineCallback<T> &); \
-    template void CallbackDirectory::registerCallback<T>(quint64, const QWebEngineCallback<T> &); \
+    template void CallbackDirectory::registerCallback<T>(QT_PREPEND_NAMESPACE(quint64), const QWebEngineCallback<T> &); \
 
     FOR_EACH_TYPE(DECLATE_SUPPORTED_CALLBACK_TYPE)
 #undef DECLATE_SUPPORTED_CALLBACK_TYPE
diff --git a/src/core/api/qwebenginecallback_p.h b/src/core/api/qwebenginecallback_p.h
index e44e99d..139ca53 100644
--- a/src/core/api/qwebenginecallback_p.h
+++ b/src/core/api/qwebenginecallback_p.h
@@ -50,8 +50,8 @@
 #define FOR_EACH_TYPE(F) \
     F(bool) \
     F(int) \
-    F(const QString &) \
-    F(const QVariant &)
+    F(const QT_PREPEND_NAMESPACE(QString) &) \
+    F(const QT_PREPEND_NAMESPACE(QVariant) &)
 
 
 namespace QtWebEngineCore {
@@ -66,13 +66,13 @@ public:
     ~CallbackDirectory();
 
     template<typename T>
-    void registerCallback(quint64 callbackId, const QWebEngineCallback<T> &callback);
+    void registerCallback(QT_PREPEND_NAMESPACE(quint64) callbackId, const QWebEngineCallback<T> &callback);
 
     template<typename T>
     void invokeEmpty(const QWebEngineCallback<T> &callback);
 
 #define DEFINE_INVOKE_FOR_TYPE(Type) \
-    void invoke(quint64 callbackId, Type result) { \
+    void invoke(QT_PREPEND_NAMESPACE(quint64) callbackId, Type result) { \
         invokeInternal<Type>(callbackId, std::forward<Type>(result)); \
     }
     FOR_EACH_TYPE(DEFINE_INVOKE_FOR_TYPE)