diff --git a/src/widgets/widgets/qcombobox.cpp b/src/widgets/widgets/qcombobox.cpp
index 390478f911..76f923904d 100644
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -226,6 +226,7 @@ void QComboBoxPrivate::_q_modelReset()
     }
     if (currentIndex.row() != indexBeforeChange)
         _q_emitCurrentIndexChanged(currentIndex);
+    modelChanged();
     q->update();
 }
 
diff --git a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
index 97416135db..c409698ec0 100644
--- a/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
+++ b/tests/auto/widgets/widgets/qcombobox/tst_qcombobox.cpp
@@ -531,6 +531,23 @@ void tst_QComboBox::sizeAdjustPolicy()
     QCOMPARE(testWidget->sizeHint(), content);
     testWidget->setMinimumContentsLength(0);
     QVERIFY(testWidget->sizeHint().width() < content.width());
+
+    // check AdjustToContents changes when model changes
+    content = testWidget->sizeHint();
+    QStandardItemModel *model = new QStandardItemModel(2, 1, testWidget);
+    testWidget->setModel(model);
+    QVERIFY(testWidget->sizeHint().width() < content.width());
+
+    // check AdjustToContents changes when a row is inserted into the model
+    content = testWidget->sizeHint();
+    QStandardItem *item = new QStandardItem(QStringLiteral("This is an item"));
+    model->appendRow(item);
+    QVERIFY(testWidget->sizeHint().width() > content.width());
+
+    // check AdjustToContents changes when model is reset
+    content = testWidget->sizeHint();
+    model->clear();
+    QVERIFY(testWidget->sizeHint().width() < content.width());
 }
 
 void tst_QComboBox::clear()