diff --git a/pkgs/desktops/cinnamon/cinnamon-screensaver/default.nix b/pkgs/desktops/cinnamon/cinnamon-screensaver/default.nix
index 956a87773d6d..91c495563058 100644
--- a/pkgs/desktops/cinnamon/cinnamon-screensaver/default.nix
+++ b/pkgs/desktops/cinnamon/cinnamon-screensaver/default.nix
@@ -38,6 +38,11 @@ stdenv.mkDerivation rec {
     hash = "sha256-d7h9OJ39HVQNCHNr13M1ybDFoU3Xnd1PEczGLHZU/lU=";
   };
 
+  patches = [
+    # See https://github.com/linuxmint/cinnamon-screensaver/issues/446#issuecomment-1819580053
+    ./fix-broken-theming-with-pygobject-3-46.patch
+  ];
+
   nativeBuildInputs = [
     pkg-config
     wrapGAppsHook
diff --git a/pkgs/desktops/cinnamon/cinnamon-screensaver/fix-broken-theming-with-pygobject-3-46.patch b/pkgs/desktops/cinnamon/cinnamon-screensaver/fix-broken-theming-with-pygobject-3-46.patch
new file mode 100644
index 000000000000..c594826d5261
--- /dev/null
+++ b/pkgs/desktops/cinnamon/cinnamon-screensaver/fix-broken-theming-with-pygobject-3-46.patch
@@ -0,0 +1,17 @@
+diff --git a/src/cinnamon-screensaver-main.py b/src/cinnamon-screensaver-main.py
+index 05b727c..a185159 100755
+--- a/src/cinnamon-screensaver-main.py
++++ b/src/cinnamon-screensaver-main.py
+@@ -139,9 +139,9 @@ class Main(Gtk.Application):
+ 
+             fallback_prov = Gtk.CssProvider()
+ 
+-            if fallback_prov.load_from_data(fallback_css.encode()):
+-                Gtk.StyleContext.add_provider_for_screen (Gdk.Screen.get_default(), fallback_prov, 600)
+-                Gtk.StyleContext.reset_widgets(Gdk.Screen.get_default())
++            fallback_prov.load_from_data(fallback_css.encode())
++            Gtk.StyleContext.add_provider_for_screen (Gdk.Screen.get_default(), fallback_prov, 600)
++            Gtk.StyleContext.reset_widgets(Gdk.Screen.get_default())
+ 
+ if __name__ == "__main__":
+     setproctitle.setproctitle('cinnamon-screensaver')