diff --git a/src/corelib/serialization/qdatastream.cpp b/src/corelib/serialization/qdatastream.cpp
index c6135336cf0..dddce6075f4 100644
--- a/src/corelib/serialization/qdatastream.cpp
+++ b/src/corelib/serialization/qdatastream.cpp
@@ -396,19 +396,6 @@ void QDataStream::setDevice(QIODevice *d)
     dev = d;
 }
 
-#if QT_DEPRECATED_SINCE(5, 13)
-/*!
-    \obsolete
-    Unsets the I/O device.
-    Use setDevice(nullptr) instead.
-*/
-
-void QDataStream::unsetDevice()
-{
-    setDevice(nullptr);
-}
-#endif
-
 /*!
     \fn bool QDataStream::atEnd() const
 
diff --git a/src/corelib/serialization/qdatastream.h b/src/corelib/serialization/qdatastream.h
index ad47490ebf3..19188c3d915 100644
--- a/src/corelib/serialization/qdatastream.h
+++ b/src/corelib/serialization/qdatastream.h
@@ -127,10 +127,6 @@ public:
 
     QIODevice *device() const;
     void setDevice(QIODevice *);
-#if QT_DEPRECATED_SINCE(5, 13)
-    QT_DEPRECATED_X("Use QDataStream::setDevice(nullptr) instead")
-    void unsetDevice();
-#endif
 
     bool atEnd() const;