diff --git a/preamble.tex b/preamble.tex
index a17bf9bec..95def214d 100644
--- a/preamble.tex
+++ b/preamble.tex
@@ -141,6 +141,7 @@
 \newcommand{\bibitemtitle}[1]{\emph{#1}}
 
 \usepackage[nameinlink,noabbrev]{cleveref}
+\def\autoref#1{\errmessage{You are not supposed to use \autoref; use \cref or \Cref instead.}}
 
 % Environment for definitions.
 \usepackage{amsthm}