diff --git a/cellar-gtk.py b/cellar-gtk.py
index 3d194ef..7c07baa 100755
--- a/cellar-gtk.py
+++ b/cellar-gtk.py
@@ -3,12 +3,23 @@
 from __future__ import annotations
 
 import json
+import os
+import sys
 import threading
 import urllib.error
 from dataclasses import asdict, dataclass
 from pathlib import Path
 from typing import Any, Callable
 
+# When running as a frozen binary (PyInstaller) on non-GNOME desktops (e.g. KDE),
+# no GTK theme is configured by default.  Force Adwaita so the bundled theme is
+# used and the UI renders correctly.
+if getattr(sys, "frozen", False):
+    os.environ.setdefault("GTK_THEME", "Adwaita")
+    # Allow GTK4 to fall back from Wayland to X11 if the Wayland compositor
+    # does not support the required protocols (common on some KDE setups).
+    os.environ.setdefault("GDK_BACKEND", "wayland,x11")
+
 try:
     import gi  # type: ignore[import-not-found]
 except ImportError as exc:
diff --git a/cellar.spec b/cellar.spec
index 7338f98..5d35d45 100644
--- a/cellar.spec
+++ b/cellar.spec
@@ -2,7 +2,7 @@
 """PyInstaller spec for Cellar GTK – portable all-in-one executable."""
 
 a = Analysis(
-    ["gtk_client.py"],
+    ["cellar-gtk.py"],
     pathex=[],
     binaries=[],
     datas=[],
@@ -32,7 +32,7 @@ a = Analysis(
                 "Gdk": "4.0",
                 "Gsk": "4.0",
             },
-            "icons": ["Adwaita"],
+            "icons": ["Adwaita", "hicolor"],
             "themes": ["Adwaita"],
             "languages": [],
         },