diff --git a/vignettes/estimate_infections.Rmd b/vignettes/estimate_infections.Rmd
index 21e142162..521837013 100644
--- a/vignettes/estimate_infections.Rmd
+++ b/vignettes/estimate_infections.Rmd
@@ -202,7 +202,7 @@ This model uses the following priors for the observation model,
 The model supports counts that are right-truncated, i.e. reported with a delay leading to recent counts being subject to future upwards revision. Denoting the final truncated counts with $D^{\ast}_{t}$ they are obtained form the final modelled cases $D_{t}$ by applying a given discrete truncation distribution $\zeta(\tau | \mu_{\zeta}, \sigma_{\zeta})$ with cumulative mass function $Z(\tau | \mu_{\zeta})$:
 
 \begin{equation}
-  D^ast_t = \Z (T - t | \mu_{Z}, \sigma_{Z}) D_{t}
+  D^ast_t = Z(T - t | \mu_{Z}, \sigma_{Z}) D_{t}
 \end{equation}
 
 If truncation is applied, the modelled cases $D_{t}$ are replaced by the truncated counts before confronting them with observations $C_{t}$ as described above.