diff --git a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
index 54039fda5b..dccc76b064 100644
--- a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
+++ b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
@@ -216,6 +216,8 @@ void KeyboardMapperWidget::keydown_event(GUI::KeyEvent& event)
     if (m_automatic_modifier && event.modifiers() > 0) {
         update_modifier_radio_buttons(event);
     }
+
+    event.ignore();
 }
 
 void KeyboardMapperWidget::keyup_event(GUI::KeyEvent& event)