diff --git a/src/corelib/kernel/qjniobject.h b/src/corelib/kernel/qjniobject.h
index 1f6433d44e..b088ae1c63 100644
--- a/src/corelib/kernel/qjniobject.h
+++ b/src/corelib/kernel/qjniobject.h
@@ -534,7 +534,8 @@ public:
     // This function takes ownership of the jobject and releases the local ref. before returning.
     static QJniObject fromLocalRef(jobject lref);
 
-    template <typename T>
+    template <typename T,
+              std::enable_if_t<std::is_convertible_v<T, jobject>, bool> = true>
     QJniObject &operator=(T obj)
     {
         assign(static_cast<T>(obj));
diff --git a/src/corelib/kernel/qjnitypes.h b/src/corelib/kernel/qjnitypes.h
index dfde8c7244..c03e92314e 100644
--- a/src/corelib/kernel/qjnitypes.h
+++ b/src/corelib/kernel/qjnitypes.h
@@ -21,8 +21,6 @@ template<typename Type>
 struct Object : QJniObject
 {
     using Class = Type;
-    operator jobject() const noexcept { return object(); }
-
     Q_IMPLICIT Object(jobject object) : QJniObject(object) {}
     Q_IMPLICIT Object(const QJniObject &object) : QJniObject(object) {}
     Q_IMPLICIT Object(QJniObject &&object) : QJniObject(std::move(object)) {}