diff --git a/aurweb/routers/errors.py b/aurweb/routers/errors.py
index eb935b57..9ed1e80d 100644
--- a/aurweb/routers/errors.py
+++ b/aurweb/routers/errors.py
@@ -1,14 +1,18 @@
+from http import HTTPStatus
+
 from aurweb.templates import make_context, render_template
 
 
 async def not_found(request, exc):
     context = make_context(request, "Page Not Found")
-    return render_template(request, "errors/404.html", context, 404)
+    return render_template(request, "errors/404.html", context,
+                           HTTPStatus.NOT_FOUND)
 
 
 async def service_unavailable(request, exc):
     context = make_context(request, "Service Unavailable")
-    return render_template(request, "errors/503.html", context, 503)
+    return render_template(request, "errors/503.html", context,
+                           HTTPStatus.SERVICE_UNAVAILABLE)
 
 # Maps HTTP errors to functions
 exceptions = {
diff --git a/aurweb/routers/html.py b/aurweb/routers/html.py
index 525fb626..337acce6 100644
--- a/aurweb/routers/html.py
+++ b/aurweb/routers/html.py
@@ -221,4 +221,4 @@ async def metrics(request: Request):
 
 @router.get("/raisefivethree", response_class=HTMLResponse)
 async def raise_service_unavailable(request: Request):
-    raise HTTPException(status_code=503)
+    raise HTTPException(status_code=HTTPStatus.SERVICE_UNAVAILABLE)
diff --git a/aurweb/routers/sso.py b/aurweb/routers/sso.py
index edeb7c6b..eff1c63f 100644
--- a/aurweb/routers/sso.py
+++ b/aurweb/routers/sso.py
@@ -1,6 +1,7 @@
 import time
 import uuid
 
+from http import HTTPStatus
 from urllib.parse import urlencode
 
 import fastapi
@@ -59,7 +60,8 @@ def open_session(request, conn, user_id):
     """
     if is_account_suspended(conn, user_id):
         _ = get_translator_for_request(request)
-        raise HTTPException(status_code=403, detail=_('Account suspended'))
+        raise HTTPException(status_code=HTTPStatus.FORBIDDEN,
+                            detail=_('Account suspended'))
         # TODO This is a terrible message because it could imply the attempt at
         #      logging in just caused the suspension.
 
@@ -104,7 +106,7 @@ async def authenticate(request: Request, redirect: str = None, conn=Depends(aurw
     if is_ip_banned(conn, request.client.host):
         _ = get_translator_for_request(request)
         raise HTTPException(
-            status_code=403,
+            status_code=HTTPStatus.FORBIDDEN,
             detail=_('The login form is currently disabled for your IP address, '
                      'probably due to sustained spam attacks. Sorry for the '
                      'inconvenience.'))
@@ -117,13 +119,14 @@ async def authenticate(request: Request, redirect: str = None, conn=Depends(aurw
         # Let’s give attackers as little information as possible.
         _ = get_translator_for_request(request)
         raise HTTPException(
-            status_code=400,
+            status_code=HTTPStatus.BAD_REQUEST,
             detail=_('Bad OAuth token. Please retry logging in from the start.'))
 
     sub = user.get("sub")  # this is the SSO account ID in JWT terminology
     if not sub:
         _ = get_translator_for_request(request)
-        raise HTTPException(status_code=400, detail=_("JWT is missing its `sub` field."))
+        raise HTTPException(status_code=HTTPStatus.BAD_REQUEST,
+                            detail=_("JWT is missing its `sub` field."))
 
     aur_accounts = conn.execute(select([Users.c.ID]).where(Users.c.SSOAccountID == sub)) \
                        .fetchall()