diff --git a/pkgs/development/libraries/libndtypes/default.nix b/pkgs/development/libraries/libndtypes/default.nix
index ffb2f56d67e..d27c1ba376d 100644
--- a/pkgs/development/libraries/libndtypes/default.nix
+++ b/pkgs/development/libraries/libndtypes/default.nix
@@ -4,13 +4,13 @@
 
 stdenv.mkDerivation {
   pname = "libndtypes";
-  version = "unstable-2018-11-27";
+  version = "unstable-2019-08-01";
 
   src = fetchFromGitHub {
-    owner = "plures";
+    owner = "xnd-project";
     repo = "ndtypes";
-    rev = "4d810d0c4d54c81a7136f313f0ae6623853d574a";
-    sha256 = "1kk1sa7f17ffh49jc1qlizlsj536fr3s4flb6x4rjyi81rp7psb9";
+    rev = "3ce6607c96d8fe67b72cc0c97bf595620cdd274e";
+    sha256 = "18303q0jfar1lmi4krp94plczb455zcgw772f9lb8xa5p0bkhx01";
   };
 
   # Override linker with cc (symlink to either gcc or clang)
diff --git a/pkgs/development/python-modules/ndtypes/default.nix b/pkgs/development/python-modules/ndtypes/default.nix
index 0d5923820d2..0a6e5635a4f 100644
--- a/pkgs/development/python-modules/ndtypes/default.nix
+++ b/pkgs/development/python-modules/ndtypes/default.nix
@@ -1,4 +1,6 @@
-{ buildPythonPackage
+{ stdenv
+, buildPythonPackage
+, python
 , numpy
 , libndtypes
 , isPy27
@@ -24,5 +26,14 @@ buildPythonPackage {
   postInstall = ''
     mkdir $out/include
     cp python/ndtypes/*.h $out/include
+  '' + stdenv.lib.optionalString stdenv.isDarwin ''
+    install_name_tool -add_rpath ${libndtypes}/lib $out/${python.sitePackages}/ndtypes/_ndtypes.*.so
+  '';
+
+  checkPhase = ''
+    pushd python
+    mv ndtypes _ndtypes
+    python test_ndtypes.py
+    popd
   '';
 }