diff --git a/pkgs/tools/text/multitran/libmtquery/default.nix b/pkgs/tools/text/multitran/libmtquery/default.nix
index ce4ede6cd78f..2e27056f68b3 100644
--- a/pkgs/tools/text/multitran/libmtquery/default.nix
+++ b/pkgs/tools/text/multitran/libmtquery/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     multitrandata
   ];
 
-  NIX_LDFLAGS = "-lbtree";
+  env.NIX_LDFLAGS = "-lbtree";
 
   patchPhase = ''
     sed -i -e 's@\$(DESTDIR)/usr@'$out'@' \