diff --git a/tests/unit/test_regressions.py b/tests/unit/test_regressions.py
index <HASH>..<HASH> 100644
--- a/tests/unit/test_regressions.py
+++ b/tests/unit/test_regressions.py
@@ -1515,3 +1515,13 @@ def test_isort_adding_second_comma_issue_1621():
 )
 """
     )
+
+
+def test_isort_shouldnt_duplicate_comments_issue_1631():
+    assert isort.check_code(
+        """
+import a # a comment
+import a as b # b comment
+""",
+        show_diff=True,
+    )
Add test case for issue #<I>