diff --git a/pkgs/by-name/fe/feedgnuplot/package.nix b/pkgs/by-name/fe/feedgnuplot/package.nix
index b468221f8bbb..416a4fd61fd7 100644
--- a/pkgs/by-name/fe/feedgnuplot/package.nix
+++ b/pkgs/by-name/fe/feedgnuplot/package.nix
@@ -46,7 +46,7 @@ perlPackages.buildPerlPackage rec {
   ]);
 
   # Fontconfig error: Cannot load default config file
-  FONTCONFIG_FILE = fontsConf;
+  env.FONTCONFIG_FILE = fontsConf;
 
   postPatch = ''
     patchShebangs .