diff --git a/src/corelib/tools/qcontiguouscache.h b/src/corelib/tools/qcontiguouscache.h
index fc4fb1e7cbc..41d198f9bc3 100644
--- a/src/corelib/tools/qcontiguouscache.h
+++ b/src/corelib/tools/qcontiguouscache.h
@@ -291,7 +291,7 @@ QContiguousCache<T> &QContiguousCache<T>::operator=(const QContiguousCache<T> &o
 {
     other.d->ref.ref();
     if (!d->ref.deref())
-        freeData(d);
+        freeData(p);
     d = other.d;
     if (!d->sharable)
         detach_helper();
diff --git a/tests/auto/corelib/tools/qcontiguouscache/tst_qcontiguouscache.cpp b/tests/auto/corelib/tools/qcontiguouscache/tst_qcontiguouscache.cpp
index 01855a730e1..76687bd478f 100644
--- a/tests/auto/corelib/tools/qcontiguouscache/tst_qcontiguouscache.cpp
+++ b/tests/auto/corelib/tools/qcontiguouscache/tst_qcontiguouscache.cpp
@@ -43,6 +43,8 @@ class tst_QContiguousCache : public QObject
 {
     Q_OBJECT
 private slots:
+    void assignment();
+
     void empty();
     void swap();
 
@@ -64,6 +66,16 @@ private slots:
 
 QTEST_MAIN(tst_QContiguousCache)
 
+void tst_QContiguousCache::assignment()
+{
+    // compile-only test: QTBUG-45783
+   QContiguousCache<int> cc1, cc2;
+   // copy:
+   cc1 = cc2;
+   // move:
+   cc1 = qMove(cc2);
+}
+
 void tst_QContiguousCache::empty()
 {
     QContiguousCache<int> c(10);