diff --git a/asgi_correlation_id/middleware.py b/asgi_correlation_id/middleware.py
index 72a6c70..f1fe502 100644
--- a/asgi_correlation_id/middleware.py
+++ b/asgi_correlation_id/middleware.py
@@ -19,7 +19,7 @@ def is_valid_uuid4(uuid_: str) -> bool:
     Check whether a string is a valid v4 uuid.
     """
     try:
-        return bool(UUID(uuid_, version=4))
+        return UUID(uuid_).version == 4
     except ValueError:
         return False
 
diff --git a/tests/test_middleware.py b/tests/test_middleware.py
index 4a2fba3..5848ed6 100644
--- a/tests/test_middleware.py
+++ b/tests/test_middleware.py
@@ -169,3 +169,12 @@ async def test_custom_generator():
     async with AsyncClient(app=generator_app, base_url='http://test') as client:
         response = await client.get('test', headers={'X-Request-ID': 'bad-uuid'})
         assert response.headers['X-Request-ID'] == TRANSFORMER_VALUE
+
+
+def test_is_valid_uuid4():
+    assert is_valid_uuid4('3758c31e-1177-4540-ba33-0109c405579a') is True
+    assert is_valid_uuid4('9e6454c4-21d5-4e4a-a66a-b28f15576414') is True
+    assert is_valid_uuid4('9e6454c421d54e4aa66ab28f15576414') is True
+    assert is_valid_uuid4('foo') is False
+    assert is_valid_uuid4('9e6454c4-21d5-4e4a-a66a-b28f15576414-1') is False
+    assert is_valid_uuid4('00000000000000000000000000000000') is False