diff --git a/pkgs/by-name/en/ente-auth/package.nix b/pkgs/by-name/en/ente-auth/package.nix
index da702d2a11eb..13a9da94e9c6 100644
--- a/pkgs/by-name/en/ente-auth/package.nix
+++ b/pkgs/by-name/en/ente-auth/package.nix
@@ -61,7 +61,7 @@ flutter332.buildFlutterApplication rec {
   ];
 
   # https://github.com/juliansteenbakker/flutter_secure_storage/issues/965
-  CXXFLAGS = [ "-Wno-deprecated-literal-operator" ];
+  env.CXXFLAGS = toString [ "-Wno-deprecated-literal-operator" ];
 
   # Based on https://github.com/ente-io/ente/blob/main/auth/linux/packaging/rpm/make_config.yaml
   # and https://github.com/ente-io/ente/blob/main/auth/linux/packaging/enteauth.appdata.xml