diff --git a/Userland/Libraries/LibGUI/Button.cpp b/Userland/Libraries/LibGUI/Button.cpp
index d89806d482..553b14c69d 100644
--- a/Userland/Libraries/LibGUI/Button.cpp
+++ b/Userland/Libraries/LibGUI/Button.cpp
@@ -43,6 +43,7 @@ Button::Button(String text)
         { Gfx::ButtonStyle::Coolbar, "Coolbar" });
 
     REGISTER_STRING_PROPERTY("icon", icon, set_icon_from_path);
+    REGISTER_BOOL_PROPERTY("default", is_default, set_default);
 }
 
 Button::~Button()