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-rw-r--r--lib/spack/spack/cmd/checksum.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/cmd/checksum.py b/lib/spack/spack/cmd/checksum.py
index 8a52178833..f9218b9df1 100644
--- a/lib/spack/spack/cmd/checksum.py
+++ b/lib/spack/spack/cmd/checksum.py
@@ -96,7 +96,7 @@ def checksum(parser, args):
if not versions:
tty.die("Could not fetch any available versions for %s." % pkg.name)
- versions = list(reversed(versions))
+ versions = list(reversed(sorted(versions)))
urls = [pkg.url_for_version(v) for v in versions]