diff --git a/flask_rebar/swagger_generation/generator_utils.py b/flask_rebar/swagger_generation/generator_utils.py
index eb4b1367..9e474a46 100644
--- a/flask_rebar/swagger_generation/generator_utils.py
+++ b/flask_rebar/swagger_generation/generator_utils.py
@@ -186,7 +186,7 @@ def format_path_for_swagger(path):
     return subbed_path, args
 
 
-@deprecated(eol_version="2,0")
+@deprecated(eol_version="2.0")
 def convert_header_api_key_authenticator(authenticator):
     """
     Converts a HeaderApiKeyAuthenticator object to a Swagger definition.
diff --git a/tests/swagger_generation/test_generator_utils.py b/tests/swagger_generation/test_generator_utils.py
index 2e484cf0..32181aa0 100644
--- a/tests/swagger_generation/test_generator_utils.py
+++ b/tests/swagger_generation/test_generator_utils.py
@@ -8,6 +8,7 @@
     :license: MIT, see LICENSE for details.
 """
 import unittest
+import warnings
 
 from flask_rebar.swagger_generation.generator_utils import PathArgument
 from flask_rebar.swagger_generation.generator_utils import flatten
@@ -197,30 +198,33 @@ class TestAuthenticatorConverter(unittest.TestCase):
     def test_legacy_behaviour(self):
         """Check that the AuthenticatorConverter maintains backward compatibility with functions as the converters
         """
-
-        converter = AuthenticatorConverter(
-            {HeaderApiKeyAuthenticator: convert_header_api_key_authenticator}
-        )
-        converter.register(MyCustomAuthenticator, convert_my_customer_authenticator)
-
-        auth_1 = HeaderApiKeyAuthenticator("X-Test-Header")
-        auth_2 = MyCustomAuthenticator()
-
-        registry = HandlerRegistry(default_authenticators=[auth_1, auth_2])
-
-        self.assertEqual(
-            converter.get_security_requirement(auth_1), [{"sharedSecret": []}]
-        )
-        self.assertEqual(converter.get_security_requirement(auth_2), [{"myAuth": []}])
-
-        self.assertEqual(
-            converter.get_security_schemes(registry),
-            {
-                "sharedSecret": {
-                    "type": "apiKey",
-                    "in": "header",
-                    "name": "X-Test-Header",
+        with warnings.catch_warnings(record=True) as caught_warnings:
+            converter = AuthenticatorConverter(
+                {HeaderApiKeyAuthenticator: convert_header_api_key_authenticator}
+            )
+            converter.register(MyCustomAuthenticator, convert_my_customer_authenticator)
+
+            auth_1 = HeaderApiKeyAuthenticator("X-Test-Header")
+            auth_2 = MyCustomAuthenticator()
+
+            registry = HandlerRegistry(default_authenticators=[auth_1, auth_2])
+
+            self.assertEqual(
+                converter.get_security_requirement(auth_1), [{"sharedSecret": []}]
+            )
+            self.assertEqual(
+                converter.get_security_requirement(auth_2), [{"myAuth": []}]
+            )
+
+            self.assertEqual(
+                converter.get_security_schemes(registry),
+                {
+                    "sharedSecret": {
+                        "type": "apiKey",
+                        "in": "header",
+                        "name": "X-Test-Header",
+                    },
+                    "myAuth": {"type": "basic"},
                 },
-                "myAuth": {"type": "basic"},
-            },
-        )
+            )
+        self.assertTrue(caught_warnings)