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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 df0ab5c14d..4485bbe840 100644
--- a/lib/spack/spack/architecture.py
+++ b/lib/spack/spack/architecture.py
@@ -451,7 +451,7 @@ def arch_from_dict(d):
if isinstance(d, basestring):
# We have an old spec using a string for the architecture
arch.platform = Platform('spack_compatibility')
- arch.platform_os = OperatingSystem('pre_version', '1.0')
+ arch.platform_os = OperatingSystem('unknown', '')
arch.target = Target(d)
arch.os_string = None