diff --git a/exam/ex.tex b/exam/ex.tex
index aa3a954..266bdf0 100644
--- a/exam/ex.tex
+++ b/exam/ex.tex
@@ -350,7 +350,7 @@
           $\mathsf{ch}\neq\mathsf{ch}^*$, $\mathcal{S}$ rewinds $\mathcal{V}^*$
           and goes to step 2.
       \end{itemize}
-      The simular $\mathcal{S}$ is expected probabilistic polynomial-time with
+      The simulator $\mathcal{S}$ is expected probabilistic polynomial-time with
       $2^{130}n$ time and the protocol is zero-knowledge.
 
     \item For completeness see 5e.