diff --git a/src/extension/prefdialog/parameter-string.cpp b/src/extension/prefdialog/parameter-string.cpp
index ac24c91bd6e43c45d520d78541129d5b6cfe8805..07f7cc461cd8e542d986ae55a23115ffb33fa6e2 100644
--- a/src/extension/prefdialog/parameter-string.cpp
+++ b/src/extension/prefdialog/parameter-string.cpp
@@ -201,8 +201,10 @@ Gtk::Widget *ParamString::get_widget(sigc::signal<void ()> *changeSignal)
         auto const textarea = Gtk::make_managed<Gtk::ScrolledWindow>();
         textarea->set_vexpand();
         textarea->set_has_frame(true);
+        textarea->set_propagate_natural_height();
 
         auto const entry = Gtk::make_managed<ParamMultilineStringEntry>(this, changeSignal);
+        entry->set_vexpand();
         textarea->set_child(*entry);
 
         UI::pack_start(*box, *textarea, true, true);