--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@@ -724,9 +724,7 @@
         case Qt::Key_Select:
 #endif
             if (view->currentIndex().isValid() && view->currentIndex().flags().testFlag(Qt::ItemIsEnabled)) {
-                combo->hidePopup();
                 keyEvent->accept();
-                emit itemSelected(view->currentIndex());
             }
             return true;
         case Qt::Key_Down:
@@ -802,6 +800,28 @@
     if (QGraphicsProxyWidget *proxy = graphicsProxyWidget())
         proxy->hide();
 #endif
+}
+
+void QComboBoxPrivateContainer::keyPressEvent(QKeyEvent *e)
+{
+    switch (e->key()) {
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+#ifdef QT_KEYPAD_NAVIGATION
+    case Qt::Key_Select:
+#endif
+        if (isVisible() && view->currentIndex().isValid() && view->currentIndex().flags().testFlag(Qt::ItemIsEnabled)) {
+            e->accept();
+            emit itemSelected(view->currentIndex());
+            close();
+            return;
+        }
+        break;
+    default:
+        break;
+    }
+
+    QFrame::keyPressEvent(e);
 }
 
 void QComboBoxPrivateContainer::mousePressEvent(QMouseEvent *e)

--- a/src/widgets/widgets/qcombobox_p.h
+++ b/src/widgets/widgets/qcombobox_p.h
@@ -206,6 +206,7 @@
 protected:
     void changeEvent(QEvent *e) override;
     bool eventFilter(QObject *o, QEvent *e) override;
+    void keyPressEvent(QKeyEvent *e) override;
     void mousePressEvent(QMouseEvent *e) override;
     void mouseReleaseEvent(QMouseEvent *e) override;
     void showEvent(QShowEvent *e) override;