diff --git a/pkgs/development/libraries/waylandpp/default.nix b/pkgs/development/libraries/waylandpp/default.nix
index 6d0b9dea1dd0..61ac0a51cfdc 100644
--- a/pkgs/development/libraries/waylandpp/default.nix
+++ b/pkgs/development/libraries/waylandpp/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   # Complains about not being able to find the fontconfig config file otherwise
-  FONTCONFIG_FILE = lib.optional docSupport (makeFontsConf {
+  env.FONTCONFIG_FILE = lib.optional docSupport (makeFontsConf {
     fontDirectories = [ ];
   });