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-rw-r--r--lib/spack/spack/cmd/url.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/cmd/url.py b/lib/spack/spack/cmd/url.py
index 38dd6a4aeb..cb151b26d9 100644
--- a/lib/spack/spack/cmd/url.py
+++ b/lib/spack/spack/cmd/url.py
@@ -339,7 +339,7 @@ def url_stats(args):
for pkg_cls in spack.repo.PATH.all_package_classes():
npkgs += 1
- for v in pkg_cls.versions:
+ for v in list(pkg_cls.versions):
try:
pkg = pkg_cls(spack.spec.Spec(pkg_cls.name))
fetcher = fs.for_package_version(pkg, v)