diff --git a/pkgs/development/libraries/libnatpmp/default.nix b/pkgs/development/libraries/libnatpmp/default.nix
index 11b8d66b4a8..36c1c0dc098 100644
--- a/pkgs/development/libraries/libnatpmp/default.nix
+++ b/pkgs/development/libraries/libnatpmp/default.nix
@@ -18,6 +18,10 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "INSTALLPREFIX=$(out)" ];
 
+  postFixup = ''
+    chmod +x $out/lib/*
+  '';
+
   meta = with lib; {
     homepage = "http://miniupnp.free.fr/libnatpmp.html";
     description = "NAT-PMP client";