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-rw-r--r--var/spack/repos/builtin/packages/py-m2r/package.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/var/spack/repos/builtin/packages/py-m2r/package.py b/var/spack/repos/builtin/packages/py-m2r/package.py
index 0680e02416..8a493f52e4 100644
--- a/var/spack/repos/builtin/packages/py-m2r/package.py
+++ b/var/spack/repos/builtin/packages/py-m2r/package.py
@@ -25,5 +25,5 @@ class PyM2r(PythonPackage):
version('0.1.8', sha256='2bfeb2f3de5f9fe9cd411aba82767a6473a43db96ca1730c03b0fe0167239b7e')
depends_on('py-setuptools', type='build')
- depends_on('py-mistune', type=('build', 'run'))
+ depends_on('py-mistune@:1', type=('build', 'run'))
depends_on('py-docutils', type=('build', 'run'))