diff --git a/GTK4-MIGRATION.md b/GTK4-MIGRATION.md
index d0110234e..4e78dbfe1 100644
--- a/GTK4-MIGRATION.md
+++ b/GTK4-MIGRATION.md
@@ -267,6 +267,20 @@ This avoids the GTK 3 pattern of connecting to `destroy` on every window to
 remove stale dict entries, which is fragile under GTK 4 where windows
 participate in `Gtk.Application`'s lifecycle automatically.
 
+## Gtk.EntryCompletion
+
+`Gtk.EntryCompletion` is deprecated in GTK 4 but still ships and still
+works. Its intended replacement, `Gtk.SuggestionEntry`, has not yet
+landed — it is slated for GTK 5. Until then, widgets that need an
+autocomplete dropdown under a `Gtk.Entry` (we have one,
+`SearchableEntrybox`) keep using `Gtk.EntryCompletion` as-is.
+
+A hand-rolled replacement was attempted (non-autohiding `Gtk.Popover`
+with a `Gtk.FilterListModel`-backed `Gtk.ListView`); it works, but the
+focus dance required to keep typing alive while the popover is visible
+isn't worth carrying for the duration of the GTK 4 cycle. When
+`Gtk.SuggestionEntry` lands, swap `SearchableEntrybox` over to it.
+
 ## GridView Thumb-Drag Flicker (Unresolved)
 
 **Symptom**: In the games grid, holding the scrollbar thumb still — not moving
diff --git a/lutris/gui/widgets/searchable_entrybox.py b/lutris/gui/widgets/searchable_entrybox.py
index 9d36ff617..a7762e6b2 100644
--- a/lutris/gui/widgets/searchable_entrybox.py
+++ b/lutris/gui/widgets/searchable_entrybox.py
@@ -21,6 +21,15 @@ class SearchableEntrybox(Gtk.Box):
         self.liststore = Gtk.ListStore(str, str)
         self.entry = Gtk.Entry()
 
+        # Gtk.EntryCompletion is deprecated in GTK 4 and the replacement
+        # (Gtk.SuggestionEntry) has not landed yet — we use it as-is until
+        # then. When it's removed, this is the thing to swap out.
+        self._completion = Gtk.EntryCompletion()
+        self._completion.set_model(self.liststore)
+        self._completion.set_text_column(0)
+        self._completion.set_match_func(self.search_store)
+        self.entry.set_completion(self._completion)
+
         # Popover menu for the choice list
         self._popup_menu_model = Gio.Menu()
         self._popup_action_group = Gio.SimpleActionGroup()