diff --git a/tests/db/test_cursor.py b/tests/db/test_cursor.py
index 9287b403..bab77312 100644
--- a/tests/db/test_cursor.py
+++ b/tests/db/test_cursor.py
@@ -147,6 +147,11 @@ def test_apply_parameters(self):
             apply_parameters("SELECT %(key)s", {"key": False}), "SELECT FALSE"
         )
 
+        self.assertEqual(
+            apply_parameters("SELECT * FROM t WHERE name LIKE '%%a'", None),
+            "SELECT * FROM t WHERE name LIKE '%a'",
+        )
+
 
 if __name__ == "__main__":
     unittest.main()