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-rw-r--r--lib/spack/spack/cmd/pkg.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/cmd/pkg.py b/lib/spack/spack/cmd/pkg.py
index 448f762841..cf478d3763 100644
--- a/lib/spack/spack/cmd/pkg.py
+++ b/lib/spack/spack/cmd/pkg.py
@@ -79,7 +79,7 @@ def list_packages(rev):
git = get_git()
relpath = spack.packages_path[len(spack.prefix + os.path.sep):] + os.path.sep
output = git('ls-tree', '--full-tree', '--name-only', rev, relpath,
- return_output=True)
+ output=str)
return sorted(line[len(relpath):] for line in output.split('\n') if line)