diff --git a/pkgs/os-specific/linux/gtkgreet/default.nix b/pkgs/os-specific/linux/gtkgreet/default.nix
index 7ab7c01475b..e0ebbb3bc4c 100644
--- a/pkgs/os-specific/linux/gtkgreet/default.nix
+++ b/pkgs/os-specific/linux/gtkgreet/default.nix
@@ -40,6 +40,9 @@ stdenv.mkDerivation rec {
     "-Dlayershell=enabled"
   ];
 
+  # G_APPLICATION_FLAGS_NONE is deprecated in GLib 2.73.3+.
+  NIX_CFLAGS_COMPILE = "-Wno-error=deprecated-declarations";
+
   meta = with lib; {
     description = "GTK based greeter for greetd, to be run under cage or similar";
     homepage = "https://git.sr.ht/~kennylevinsen/gtkgreet";