diff --git a/pkgs/by-name/vi/virtiofsd/package.nix b/pkgs/by-name/vi/virtiofsd/package.nix
index 19b607a1aab7..1b3ef67272c8 100644
--- a/pkgs/by-name/vi/virtiofsd/package.nix
+++ b/pkgs/by-name/vi/virtiofsd/package.nix
@@ -23,8 +23,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   cargoHash = "sha256-AOWHlvFvKj05f4/KE1F37qkRstW5gUlRH0HZVZrg7Dg=";
 
-  LIBCAPNG_LIB_PATH = "${lib.getLib libcap_ng}/lib";
-  LIBCAPNG_LINK_TYPE = if stdenv.hostPlatform.isStatic then "static" else "dylib";
+  env = {
+    LIBCAPNG_LIB_PATH = "${lib.getLib libcap_ng}/lib";
+    LIBCAPNG_LINK_TYPE = if stdenv.hostPlatform.isStatic then "static" else "dylib";
+  };
 
   buildInputs = [
     libcap_ng