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-rw-r--r--django/contrib/admin/widgets.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index 271bbefb99..5af187a5c3 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -413,7 +413,7 @@ class AutocompleteMixin:
'data-theme': 'admin-autocomplete',
'data-allow-clear': json.dumps(not self.is_required),
'data-placeholder': '', # Allows clearing of the input.
- 'class': attrs['class'] + 'admin-autocomplete',
+ 'class': attrs['class'] + (' ' if attrs['class'] else '') + 'admin-autocomplete',
})
return attrs