diff --git a/var/spack/repos/builtin/packages/ruby-narray/package.py b/var/spack/repos/builtin/packages/ruby-narray/package.py
index c35fcfc5be5..0f38c039f74 100644
--- a/var/spack/repos/builtin/packages/ruby-narray/package.py
+++ b/var/spack/repos/builtin/packages/ruby-narray/package.py
@@ -11,7 +11,9 @@ class RubyNarray(RubyPackage):
 
     homepage = "https://masa16.github.io/narray/"
     url      = "https://github.com/ruby-numo/numo-narray/archive/v0.9.1.8.tar.gz"
+    git      = "https://github.com/ruby-numo/numo-narray.git"
 
+    version('master',  branch='master')
     version('0.9.1.8', sha256='48814c6ebf2c4846fcf6cfd2705a15a97a608960c1676cb6c7b5c9254b0dd51b')
 
     depends_on('ruby@2.2:2.999', type=('build', 'run'))