diff --git a/rdflib/util.py b/rdflib/util.py
index 7318dcc36..c98dfdac7 100644
--- a/rdflib/util.py
+++ b/rdflib/util.py
@@ -364,6 +364,7 @@ def parse_date_time(val):
     "html": "rdfa",
     "svg": "rdfa",
     "nq": "nquads",
+    "nquads": "nquads",
     "trig": "trig",
     "json": "json-ld",
     "jsonld": "json-ld",
diff --git a/test/test_parse_file_guess_format.py b/test/test_parse_file_guess_format.py
index b1ec6c9f0..5c70e7b65 100644
--- a/test/test_parse_file_guess_format.py
+++ b/test/test_parse_file_guess_format.py
@@ -28,6 +28,8 @@ def test_guess_format(self) -> None:
         self.assertEqual(guess_format("../../relative/place/on/disk/example.json"), "json-ld")
         self.assertEqual(guess_format("example.rdf"), "xml")
         self.assertEqual(guess_format("example.nt"), "nt")
+        self.assertEqual(guess_format("example.nq"), "nquads")
+        self.assertEqual(guess_format("example.nquads"), "nquads")
         self.assertEqual(guess_format("example.n3"), "n3")
         self.assertIsNone(guess_format("example.docx", None))
         self.assertIsNone(guess_format("example", None))