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-rw-r--r--lib/spack/spack/util/unparse/unparser.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/util/unparse/unparser.py b/lib/spack/spack/util/unparse/unparser.py
index 529ed5209f..001bcd647e 100644
--- a/lib/spack/spack/util/unparse/unparser.py
+++ b/lib/spack/spack/util/unparse/unparser.py
@@ -415,7 +415,7 @@ class Unparser:
self.dispatch(deco)
self.fill("class " + t.name)
if six.PY3:
- with self.delimit("(", ")"):
+ with self.delimit_if("(", ")", condition=t.bases or t.keywords):
comma = False
for e in t.bases:
if comma: