diff --git a/pkgs/by-name/dn/dnspeep/package.nix b/pkgs/by-name/dn/dnspeep/package.nix
index bbdb1a80aecf..a7767de99e47 100644
--- a/pkgs/by-name/dn/dnspeep/package.nix
+++ b/pkgs/by-name/dn/dnspeep/package.nix
@@ -18,8 +18,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   cargoHash = "sha256-tZlh7+END6oOy3uWOrjle+nwqFhMU6bbXmr4hdt6gqY=";
 
-  LIBPCAP_LIBDIR = lib.makeLibraryPath [ libpcap ];
-  LIBPCAP_VER = libpcap.version;
+  env = {
+    LIBPCAP_LIBDIR = lib.makeLibraryPath [ libpcap ];
+    LIBPCAP_VER = libpcap.version;
+  };
 
   meta = {
     description = "Spy on the DNS queries your computer is making";