diff --git a/lib/spack/spack/architecture.py b/lib/spack/spack/architecture.py index df0ab5c14de..4485bbe8401 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