diff --git a/nixos/modules/security/apparmor-suid.nix b/nixos/modules/security/apparmor-suid.nix
index 3da6a81158d0..c2dc84e6a75c 100644
--- a/nixos/modules/security/apparmor-suid.nix
+++ b/nixos/modules/security/apparmor-suid.nix
@@ -30,7 +30,7 @@ with lib;
 
         ${pkgs.glibc.out}/lib/*.so mr,
         ${pkgs.libcap}/lib/libcap.so* mr,
-        ${pkgs.attr}/lib/libattr.so* mr,
+        ${pkgs.attr.out}/lib/libattr.so* mr,
 
         ${pkgs.iputils}/bin/ping mixr,
         /var/setuid-wrappers/ping.real r,
diff --git a/pkgs/tools/filesystems/xtreemfs/default.nix b/pkgs/tools/filesystems/xtreemfs/default.nix
index 8f090c297813..556cb674212d 100644
--- a/pkgs/tools/filesystems/xtreemfs/default.nix
+++ b/pkgs/tools/filesystems/xtreemfs/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
       --replace "/usr/local" "${valgrind}"
 
     substituteInPlace cpp/CMakeLists.txt \
-      --replace '"/lib64" "/usr/lib64"' '"${attr}/lib" "${fuse}/lib"'
+      --replace '"/lib64" "/usr/lib64"' '"${attr.out}/lib" "${fuse}/lib"'
 
     export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${fuse}/include"
     export NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -L${fuse}/lib"