diff --git a/axes/handlers/cache.py b/axes/handlers/cache.py
index e1f21ef..cfaa56a 100644
--- a/axes/handlers/cache.py
+++ b/axes/handlers/cache.py
@@ -128,6 +128,7 @@ class AxesCacheHandler(AbstractAxesHandler, AxesBaseHandler):
             )
 
             request.axes_locked_out = True
+            request.axes_credentials = credentials
             user_locked_out.send(
                 "axes",
                 request=request,
diff --git a/axes/handlers/database.py b/axes/handlers/database.py
index 8939814..2995c06 100644
--- a/axes/handlers/database.py
+++ b/axes/handlers/database.py
@@ -186,6 +186,7 @@ class AxesDatabaseHandler(AbstractAxesHandler, AxesBaseHandler):
             )
 
             request.axes_locked_out = True
+            request.axes_credentials = credentials
             user_locked_out.send(
                 "axes",
                 request=request,
diff --git a/axes/handlers/proxy.py b/axes/handlers/proxy.py
index 670fad1..a539db3 100644
--- a/axes/handlers/proxy.py
+++ b/axes/handlers/proxy.py
@@ -78,6 +78,7 @@ class AxesProxyHandler(AbstractAxesHandler, AxesBaseHandler):
             request.axes_http_accept = get_client_http_accept(request)
             request.axes_failures_since_start = None
             request.axes_updated = True
+            request.axes_credentials = None
 
     @classmethod
     def is_locked(cls, request, credentials: dict = None) -> bool:
diff --git a/axes/middleware.py b/axes/middleware.py
index b493f2c..8e29707 100644
--- a/axes/middleware.py
+++ b/axes/middleware.py
@@ -37,6 +37,7 @@ class AxesMiddleware:
 
         if settings.AXES_ENABLED:
             if getattr(request, "axes_locked_out", None):
-                response = get_lockout_response(request)  # type: ignore
+                credentials = getattr(request, 'axes_credentials', None)
+                response = get_lockout_response(request, credentials)  # type: ignore
 
         return response
diff --git a/tests/test_middleware.py b/tests/test_middleware.py
index a5c8e41..8b098d1 100644
--- a/tests/test_middleware.py
+++ b/tests/test_middleware.py
@@ -1,3 +1,4 @@
+from django.conf import settings
 from django.http import HttpResponse, HttpRequest
 from django.test import override_settings
 
@@ -5,6 +6,10 @@ from axes.middleware import AxesMiddleware
 from tests.base import AxesTestCase
 
 
+def get_username(request, credentials: dict) -> str:
+    return credentials.get(settings.AXES_USERNAME_FORM_FIELD)
+
+
 class MiddlewareTestCase(AxesTestCase):
     STATUS_SUCCESS = 200
     STATUS_LOCKOUT = 403
@@ -28,6 +33,17 @@ class MiddlewareTestCase(AxesTestCase):
         response = AxesMiddleware(get_response)(self.request)
         self.assertEqual(response.status_code, self.STATUS_LOCKOUT)
 
+    @override_settings(AXES_USERNAME_CALLABLE="tests.test_middleware.get_username")
+    def test_lockout_response_with_axes_callable_username(self):
+        def get_response(request):
+            request.axes_locked_out = True
+            request.axes_credentials = {settings.AXES_USERNAME_FORM_FIELD: 'username'}
+
+            return HttpResponse()
+
+        response = AxesMiddleware(get_response)(self.request)
+        self.assertEqual(response.status_code, self.STATUS_LOCKOUT)
+
     @override_settings(AXES_ENABLED=False)
     def test_respects_enabled_switch(self):
         def get_response(request):