diff --git a/pkgs/os-specific/linux/trace-cmd/default.nix b/pkgs/os-specific/linux/trace-cmd/default.nix
index 4a71afc5b9b9..8095c5cbece6 100644
--- a/pkgs/os-specific/linux/trace-cmd/default.nix
+++ b/pkgs/os-specific/linux/trace-cmd/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     "devman"
   ];
 
-  MANPAGE_DOCBOOK_XSL = "${docbook_xsl}/xml/xsl/docbook/manpages/docbook.xsl";
+  env.MANPAGE_DOCBOOK_XSL = "${docbook_xsl}/xml/xsl/docbook/manpages/docbook.xsl";
 
   dontConfigure = true;