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-rw-r--r--lib/spack/spack/operating_systems/mac_os.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/operating_systems/mac_os.py b/lib/spack/spack/operating_systems/mac_os.py
index 3e5ab9b2e9..dafb5c1d41 100644
--- a/lib/spack/spack/operating_systems/mac_os.py
+++ b/lib/spack/spack/operating_systems/mac_os.py
@@ -22,7 +22,7 @@ class MacOs(OperatingSystem):
"10.11": "elcapitan",
"10.12": "sierra"}
- mac_ver = py_platform.mac_ver()[0][:-2]
+ mac_ver = '.'.join(py_platform.mac_ver()[0].split('.')[:2])
name = mac_releases.get(mac_ver, "macos")
super(MacOs, self).__init__(name, mac_ver)