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-rw-r--r--lib/spack/spack/spec.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index b71c1d680c..b604420140 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -762,7 +762,7 @@ class Spec(object):
self.to_node_dict(), default_flow_style=True, width=sys.maxint)
sha = hashlib.sha1(yaml_text)
b32_hash = base64.b32encode(sha.digest()).lower()[:length]
- if self._concrete:
+ if self.concrete:
self.hash = b32_hash
return b32_hash