Index: qt/pinentrydialog.cpp
===================================================================
--- qt/pinentrydialog.cpp
+++ qt/pinentrydialog.cpp
@@ -280,6 +280,7 @@
     mainLayout->addLayout(hbox);
     mainLayout->addStretch(1);
     mainLayout->addWidget(buttons);
+    mainLayout->setSizeConstraint(QLayout::SetFixedSize);
 
     auto capsLockWatcher = new CapsLockWatcher{this};
     connect(capsLockWatcher, &CapsLockWatcher::stateChanged,