diff --git a/chapters/functions.tex b/chapters/functions.tex
index 7734cecd6..39ed55cc9 100644
--- a/chapters/functions.tex
+++ b/chapters/functions.tex
@@ -1536,7 +1536,7 @@ \subsection{Using the Inverse Annotation}\label{using-the-inverse-annotation}
   output $T_2$ $y$;
 algorithm
   $\ldots$
-  annotation(inverse($u_k$ = $f_2$($\ldots$, $y$, $\ldots$));
+  annotation(inverse($u_k$ = $f_2$($\ldots$, $y$, $\ldots$)));
 end $f_1$;
 \end{lstlisting}