diff --git a/pkgs/development/ocaml-modules/yojson/default.nix b/pkgs/development/ocaml-modules/yojson/default.nix
index 9237db080d6..562d25550da 100644
--- a/pkgs/development/ocaml-modules/yojson/default.nix
+++ b/pkgs/development/ocaml-modules/yojson/default.nix
@@ -4,16 +4,18 @@ let
   version = "1.1.8";
   webpage = "http://mjambon.com/${pname}.html";
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
 
-  name = "${pname}-${version}";
+  name = "ocaml-${pname}-${version}";
 
   src = fetchurl {
-    url = "http://mjambon.com/releases/${pname}/${name}.tar.gz";
+    url = "http://mjambon.com/releases/${pname}/${pname}-${version}.tar.gz";
     sha256 = "0ayx17dimnpavdfyq6dk9xv2x1fx69by85vc6vl3nqxjkcv5d2rv";
   };
 
-  buildInputs = [ ocaml findlib cppo easy-format biniou ];
+  buildInputs = [ ocaml findlib ];
+
+  propagatedBuildInputs = [ cppo easy-format biniou ];
 
   createFindlibDestdir = true;
 
diff --git a/pkgs/development/tools/ocaml/merlin/default.nix b/pkgs/development/tools/ocaml/merlin/default.nix
index c0882439f5c..970c07f3546 100644
--- a/pkgs/development/tools/ocaml/merlin/default.nix
+++ b/pkgs/development/tools/ocaml/merlin/default.nix
@@ -1,14 +1,14 @@
-{stdenv, fetchurl, ocaml, findlib, easy-format, biniou, yojson, menhir}:
+{stdenv, fetchurl, ocaml, findlib, yojson, menhir}:
 stdenv.mkDerivation {
 
-  name = "merlin-1.6";
+  name = "merlin-1.7.1";
 
   src = fetchurl {
-    url = "https://github.com/the-lambda-church/merlin/archive/v1.6.tar.gz";
-    sha256 = "0wq75hgffaszazrhkl0nfjxgx8bvazi2sjannd8q64hvax8hxzcy";
+    url = https://github.com/the-lambda-church/merlin/archive/v1.7.1.tar.gz;
+    sha256 = "c3b60c7b3fddaa2860e0d8ac0d4fed2ed60e319875734c7ac1a93df524c67aff";
   };
 
-  buildInputs = [ ocaml findlib biniou yojson menhir easy-format ];
+  buildInputs = [ ocaml findlib yojson menhir ];
 
   prefixKey = "--prefix ";