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-rw-r--r--lib/spack/spack/architecture.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/architecture.py b/lib/spack/spack/architecture.py
index 9b4c6e576d..0c4b605e91 100644
--- a/lib/spack/spack/architecture.py
+++ b/lib/spack/spack/architecture.py
@@ -65,7 +65,7 @@ def get_mac_sys_type():
if not mac_ver:
return None
- return "macosx_{}_{}".format(
+ return "macosx_%s_%s" % (
Version(mac_ver).up_to(2), py_platform.machine())