diff --git a/pkgs/servers/sql/postgresql/9.0.x.nix b/pkgs/servers/sql/postgresql/9.0.x.nix
index 4249b40c5c4a..7b4d7a2e617c 100644
--- a/pkgs/servers/sql/postgresql/9.0.x.nix
+++ b/pkgs/servers/sql/postgresql/9.0.x.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation rec {
 
   patches = [ ./less-is-more.patch ];
 
+  postInstall = ''mkdir -p $doc'';
+
   passthru = {
     inherit readline;
     psqlSchema = "9.0";