diff --git a/pkgs/by-name/de/denemo/package.nix b/pkgs/by-name/de/denemo/package.nix
index ac500882d15f..2dc1d61a776f 100644
--- a/pkgs/by-name/de/denemo/package.nix
+++ b/pkgs/by-name/de/denemo/package.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation {
   ];
 
   # error by default in GCC 14
-  NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
 
   preFixup = ''
     gappsWrapperArgs+=(