diff --git a/pkgs/development/ocaml-modules/cryptokit/default.nix b/pkgs/development/ocaml-modules/cryptokit/default.nix
index 8180373a3dd..8181433e1ee 100644
--- a/pkgs/development/ocaml-modules/cryptokit/default.nix
+++ b/pkgs/development/ocaml-modules/cryptokit/default.nix
@@ -30,7 +30,7 @@ stdenv.mkDerivation {
 
   buildFlags = "setup.data build";
 
-  preBuild = "mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/cryptokit";
+  preBuild = "mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/stublibs";
 
   meta = {
     homepage = http://pauillac.inria.fr/~xleroy/software.html;
diff --git a/pkgs/development/ocaml-modules/ocsigen-server/default.nix b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
index 9499bff84a1..df484b230c2 100644
--- a/pkgs/development/ocaml-modules/ocsigen-server/default.nix
+++ b/pkgs/development/ocaml-modules/ocsigen-server/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
   ''
   rm -rf $out/var/run
   wrapProgram $out/bin/ocsigenserver \
-    --prefix CAML_LD_LIBRARY_PATH : "${mkpath ssl "ssl"}:${mkpath ocamlnet "netsys"}:${mkpath ocamlnet "netstring"}:${mkpath ocaml_pcre "pcre"}:${mkpath cryptokit "cryptokit"}:${mkpath ocaml_sqlite3 "sqlite3"}"
+    --prefix CAML_LD_LIBRARY_PATH : "$CAML_LD_LIBRARY_PATH:${mkpath ssl "ssl"}:${mkpath ocamlnet "netsys"}:${mkpath ocamlnet "netstring"}:${mkpath ocaml_pcre "pcre"}:${mkpath ocaml_sqlite3 "sqlite3"}"
   '';
 
   dontPatchShebangs = true;