diff --git a/pkgs/by-name/ne/netop/package.nix b/pkgs/by-name/ne/netop/package.nix
index e303475d1804..103fa61fd84a 100644
--- a/pkgs/by-name/ne/netop/package.nix
+++ b/pkgs/by-name/ne/netop/package.nix
@@ -16,8 +16,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
     hash = "sha256-Rnp2VNAi8BNbKqkGFoYUb4C5db5BS1P1cqpWlroTmdQ=";
   };
 
-  LIBPCAP_LIBDIR = lib.makeLibraryPath [ libpcap ];
-  LIBPCAP_VER = libpcap.version;
+  env = {
+    LIBPCAP_LIBDIR = lib.makeLibraryPath [ libpcap ];
+    LIBPCAP_VER = libpcap.version;
+  };
 
   cargoHash = "sha256-WGwtRMARwRvcUflN3JYL32aib+IG1Q0j0D9BEfaiME4=";