diff --git a/pkgs/by-name/ca/cargo-lambda/package.nix b/pkgs/by-name/ca/cargo-lambda/package.nix
index ec87d7a95376..6d6bc5a3b780 100644
--- a/pkgs/by-name/ca/cargo-lambda/package.nix
+++ b/pkgs/by-name/ca/cargo-lambda/package.nix
@@ -51,7 +51,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     wrapProgram $out/bin/cargo-lambda --prefix PATH : ${lib.makeBinPath [ zig_0_13 ]}
   '';
 
-  CARGO_LAMBDA_BUILD_INFO = "(nixpkgs)";
+  env.CARGO_LAMBDA_BUILD_INFO = "(nixpkgs)";
 
   cargoBuildFlags = [ "--features=skip-build-banner" ];
   cargoCheckFlags = [ "--features=skip-build-banner" ];
diff --git a/pkgs/by-name/co/codebook/package.nix b/pkgs/by-name/co/codebook/package.nix
index f918d785faf0..3da924bec58e 100644
--- a/pkgs/by-name/co/codebook/package.nix
+++ b/pkgs/by-name/co/codebook/package.nix
@@ -20,8 +20,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
   buildAndTestSubdir = "crates/codebook-lsp";
   cargoHash = "sha256-hxPgYGBq+KZfEyFiHQG31cNEN6A6hUgKRgZXIHOGalw=";
 
-  CARGO_PROFILE_RELEASE_LTO = "fat";
-  CARGO_PROFILE_RELEASE_CODEGEN_UNITS = "1";
+  env = {
+    CARGO_PROFILE_RELEASE_LTO = "fat";
+    CARGO_PROFILE_RELEASE_CODEGEN_UNITS = "1";
+  };
 
   # Integration tests require internet access for dictionaries
   doCheck = false;
diff --git a/pkgs/by-name/ec/ecc/package.nix b/pkgs/by-name/ec/ecc/package.nix
index 5ad96e6cd549..aee4052f8132 100644
--- a/pkgs/by-name/ec/ecc/package.nix
+++ b/pkgs/by-name/ec/ecc/package.nix
@@ -78,7 +78,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     zlib
   ];
 
-  CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "gcc";
+  env.CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER = "gcc";
 
   preBuild = ''
     # `SANDBOX` defined by upstream to disable build-time network access