diff --git a/test_common.py b/test_common.py
index bfb3351..2e4a681 100644
--- a/test_common.py
+++ b/test_common.py
@@ -601,8 +601,29 @@ def identify_test_vector(kat_path):
                 return False
         return True
 
+    def is_nist_aead_kat_no_ad(kat):
+        if len(kat) != 16:
+            return False
+
+        def genstr(length):
+            return bytes([b % 256 for b in range(length)])
+        expected_k = genstr(len(kat[0][3]))
+        expected_npub = genstr(len(kat[0][4]))
+        expected_i = 0
+        expected_ad = b""
+        for i, m, ad, k, npub, c in kat:
+            expected_m = genstr(i-1)
+            expected_i += 1
+            if not (expected_i == i and expected_m == m and
+                    expected_k == k and expected_ad == ad and
+                    expected_npub == npub):
+                return False
+        return True
+
     if is_nist_aead_kat(kat):
         return "NIST AEAD KAT"
+    if is_nist_aead_kat_no_ad(kat):
+        return "NIST AEAD KAT NO AD"
     return None