diff --git a/mutagen/aac.py b/mutagen/aac.py
index 274b20df..79851cea 100644
--- a/mutagen/aac.py
+++ b/mutagen/aac.py
@@ -408,12 +408,34 @@ def load(self, filething):
     def add_tags(self):
         raise AACError("doesn't support tags")
 
+    @staticmethod
+    def _is_probably_adts_header(header: bytes) -> bool:
+        if len(header) < 9:
+            return False
+
+        # Syncword
+        if not (header[0] == 0xFF):
+            return False
+        if not (header[1] & 0xF0 == 0xF0):
+            return False
+
+        # Layer
+        if not (header[1] & 0b0000_0110 == 0):
+            return False
+
+        # Sampling index
+        if ((header[2] & 0b0011_1100) >> 2) > 0xC:
+            return False
+
+        return True
+
     @staticmethod
     def score(filename, fileobj, header):
         filename = filename.lower()
         s = endswith(filename, ".aac") or endswith(filename, ".adts") or \
             endswith(filename, ".adif")
         s += b"ADIF" in header
+        s += int(AAC._is_probably_adts_header(header))
         return s
 
 
diff --git a/tests/test_aac.py b/tests/test_aac.py
index ea1e9b20..1db959ad 100644
--- a/tests/test_aac.py
+++ b/tests/test_aac.py
@@ -10,14 +10,14 @@
 class TADTS(TestCase):
 
     def setUp(self):
-        original = os.path.join(DATA_DIR, "empty.aac")
-        self.filename = get_temp_copy(original)
+        self.original = os.path.join(DATA_DIR, "empty.aac")
+        self.filename = get_temp_copy(self.original)
 
         tag = ID3()
         tag.add(TIT1(text=[u"a" * 5000], encoding=3))
         tag.save(self.filename)
 
-        self.aac = AAC(original)
+        self.aac = AAC(self.original)
         self.aac_id3 = AAC(self.filename)
 
     def tearDown(self):
@@ -52,6 +52,11 @@ def test_pprint(self):
         self.assertEqual(self.aac.pprint(), self.aac_id3.pprint())
         self.assertTrue("ADTS" in self.aac.pprint())
 
+    def test_score_no_ext(self):
+        with open(self.original, "rb") as fileobj:
+            header = fileobj.read(128)
+            self.failUnless(AAC.score("empty", fileobj, header))
+
 
 class TADIF(TestCase):