diff --git a/src/corelib/thread/qrunnable.cpp b/src/corelib/thread/qrunnable.cpp
index 64a2613d27..04aa39a81e 100644
--- a/src/corelib/thread/qrunnable.cpp
+++ b/src/corelib/thread/qrunnable.cpp
@@ -31,6 +31,15 @@
 **
 ****************************************************************************/
 
+#include "qrunnable.h"
+
+QT_BEGIN_NAMESPACE
+
+QRunnable::~QRunnable()
+{
+    // Must be empty until ### Qt 6
+}
+
 /*!
     \class QRunnable
     \inmodule QtCore
@@ -98,3 +107,5 @@
 
     \sa autoDelete(), QThreadPool
 */
+
+QT_END_NAMESPACE
diff --git a/src/corelib/thread/qrunnable.h b/src/corelib/thread/qrunnable.h
index f00c58d51d..7233f33621 100644
--- a/src/corelib/thread/qrunnable.h
+++ b/src/corelib/thread/qrunnable.h
@@ -38,8 +38,7 @@
 
 QT_BEGIN_NAMESPACE
 
-
-class QRunnable
+class Q_CORE_EXPORT QRunnable
 {
     int ref;
 
@@ -51,7 +50,7 @@ public:
     virtual void run() = 0;
 
     QRunnable() : ref(0) { }
-    virtual ~QRunnable() { }
+    virtual ~QRunnable();
 
     bool autoDelete() const { return ref != -1; }
     void setAutoDelete(bool _autoDelete) { ref = _autoDelete ? 0 : -1; }