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-rw-r--r--pyramid/httpexceptions.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pyramid/httpexceptions.py b/pyramid/httpexceptions.py
index ac4f57738..734080434 100644
--- a/pyramid/httpexceptions.py
+++ b/pyramid/httpexceptions.py
@@ -1156,7 +1156,7 @@ for name, value in list(globals().items()):
if (
isinstance(value, class_types) and
issubclass(value, HTTPException) and
- value not in [HTTPClientError, HTTPServerError] and
+ value not in {HTTPClientError, HTTPServerError} and
not name.startswith('_')
):
code = getattr(value, 'code', None)