diff --git a/pkgs/development/compilers/ghc/9.0.2-binary.nix b/pkgs/development/compilers/ghc/9.0.2-binary.nix
index 4239212f2879d..cc3eb43b8ac0b 100644
--- a/pkgs/development/compilers/ghc/9.0.2-binary.nix
+++ b/pkgs/development/compilers/ghc/9.0.2-binary.nix
@@ -250,7 +250,7 @@ stdenv.mkDerivation {
   # of the bindist installer can find the libraries they expect.
   # Cannot patchelf beforehand due to relative RPATHs that anticipate
   # the final install location.
-  ${libEnvVar} = libPath;
+  env.${libEnvVar} = libPath;
 
   postUnpack =
     # Verify our assumptions of which `libtinfo.so` (ncurses) version is used,
diff --git a/pkgs/development/compilers/ghc/9.8.4-binary.nix b/pkgs/development/compilers/ghc/9.8.4-binary.nix
index 35f692d41eb59..c19b35a51a618 100644
--- a/pkgs/development/compilers/ghc/9.8.4-binary.nix
+++ b/pkgs/development/compilers/ghc/9.8.4-binary.nix
@@ -232,7 +232,7 @@ stdenv.mkDerivation {
   # of the bindist installer can find the libraries they expect.
   # Cannot patchelf beforehand due to relative RPATHs that anticipate
   # the final install location.
-  ${libEnvVar} = libPath;
+  env.${libEnvVar} = libPath;
 
   postUnpack =
     # Verify our assumptions of which `libtinfo.so` (ncurses) version is used,