diff --git a/pkgs/development/libraries/libunwind/default.nix b/pkgs/development/libraries/libunwind/default.nix
index 3fc8b508559..da09e2fcbe2 100644
--- a/pkgs/development/libraries/libunwind/default.nix
+++ b/pkgs/development/libraries/libunwind/default.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation rec {
     sed -i -e '/LIBLZMA/s:-lzma:-llzma:' configure
   '';
 
+  outputs = [ "dev" "out" ];
+
   propagatedBuildInputs = [ xz ];
 
   NIX_CFLAGS_COMPILE = if stdenv.system == "x86_64-linux" then "-fPIC" else "";
@@ -30,7 +32,7 @@ stdenv.mkDerivation rec {
 
   postInstall = ''
     find $out -name \*.la | while read file; do
-      sed -i 's,-llzma,${xz}/lib/liblzma.la,' $file
+      sed -i 's,-llzma,${xz.out}/lib/liblzma.la,' $file
     done
   '';