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-rw-r--r--lib/spack/spack/concretize.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/concretize.py b/lib/spack/spack/concretize.py
index eced9917c9..6f11c86ce8 100644
--- a/lib/spack/spack/concretize.py
+++ b/lib/spack/spack/concretize.py
@@ -495,7 +495,7 @@ class UnavailableCompilerVersionError(spack.error.SpackError):
def __init__(self, compiler_spec, operating_system):
super(UnavailableCompilerVersionError, self).__init__(
- "No available compiler version matches '%s' on operating_system %s" % compiler_spec, operating_system, # NOQA: ignore=E501
+ "No available compiler version matches '%s' on operating_system %s" % (compiler_spec, operating_system), # NOQA: ignore=E501
"Run 'spack compilers' to see available compiler Options.")