diff --git a/accountant/views/users.py b/accountant/views/users.py
index d8919ad..86218c9 100644
--- a/accountant/views/users.py
+++ b/accountant/views/users.py
@@ -64,6 +64,9 @@ class LoginResource(Resource):
     def post(self):
         """Login to retrieve authentication token."""
 
+        if not request.authorization:
+            ns.abort(401, "Missing authorization.")
+
         email = request.authorization['username']
         password = request.authorization['password']