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-rw-r--r--bs4/element.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/bs4/element.py b/bs4/element.py
index cdc9e36..e50f639 100644
--- a/bs4/element.py
+++ b/bs4/element.py
@@ -507,7 +507,9 @@ class Doctype(NavigableString):
value = name
if pub_id is not None:
value += ' PUBLIC "%s"' % pub_id
- if system_id is not None:
+ if system_id is not None:
+ value += ' "%s"' % system_id
+ elif system_id is not None:
value += ' SYSTEM "%s"' % system_id
return Doctype(value)