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-rw-r--r--lib/spack/spack/cmd/__init__.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/cmd/__init__.py b/lib/spack/spack/cmd/__init__.py
index d48301f5de..130abea4cc 100644
--- a/lib/spack/spack/cmd/__init__.py
+++ b/lib/spack/spack/cmd/__init__.py
@@ -435,7 +435,7 @@ def display_specs(specs, args=None, **kwargs):
out = ''
if groups:
for specs in iter_groups(specs, indent, all_headers):
- out += format_list(specs)
+ output.write(format_list(specs))
else:
out = format_list(sorted(specs))