diff --git a/tests/primitives/test_block.py b/tests/primitives/test_block.py
index 92fd31a..774885f 100644
--- a/tests/primitives/test_block.py
+++ b/tests/primitives/test_block.py
@@ -31,6 +31,13 @@
         )
         assert cipher.name == "AES-128-CBC"
 
+    def test_instantiate_without_api(self):
+        cipher = BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.CBC(binascii.unhexlify(b"0" * 32))
+        )
+        assert cipher.name == "AES-128-CBC"
+
     def test_use_after_finalize(self, api):
         cipher = BlockCipher(
             ciphers.AES(binascii.unhexlify(b"0" * 32)),