diff --git a/advection/advection-higherorder.tex b/advection/advection-higherorder.tex
index 1be6d9c..5b55fc0 100644
--- a/advection/advection-higherorder.tex
+++ b/advection/advection-higherorder.tex
@@ -508,7 +508,7 @@ \section{Method of lines approach}
 In the above constructions, we computed a time-centered flux by
 predicting the interface state to the half-time (by Taylor-expanding
 in time through $\Delta t /2$).  Instead, we can recognize that with
-the spatial discretization done in Eq.~\ref{eq:adv:fvadv}, we are left
+the spatial discretization done in Eq.~\ref{adv:eq:fvadv}, we are left
 with an ordinary differential equation in time that can then be solved
 using standard ODE techniques.