diff --git a/bears/python/PyImportSortBear.py b/bears/python/PyImportSortBear.py
index b82c264a5d..42f4f43559 100644
--- a/bears/python/PyImportSortBear.py
+++ b/bears/python/PyImportSortBear.py
@@ -169,6 +169,7 @@ def run(self, filename, file,
             forced_separate=forced_separate_imports,
             multi_line_output=isort_multi_line_output,
             known_first_party=known_first_party_imports,
+            known_third_party=known_third_party_imports,
             line_length=max_line_length,
             force_to_top=imports_forced_to_top)