diff --git a/protocol/protocol.tex b/protocol/protocol.tex
index e658031f..853d5c5a 100644
--- a/protocol/protocol.tex
+++ b/protocol/protocol.tex
@@ -459,8 +459,8 @@ electronic commerce and payment, financial privacy, proof of work, zero knowledg
 
 % Symmetric encryption
 \newcommand{\Sym}{\mathsf{Sym}}
-\newcommand{\SymEncrypt}[1]{\mathsf{Sym.}\mathtt{Encrypt}_\mathsf{#1}}
-\newcommand{\SymDecrypt}[1]{\mathsf{Sym.}\mathtt{Decrypt}_\mathsf{#1}}
+\newcommand{\SymEncrypt}[1]{\mathsf{Sym.}\mathtt{Encrypt}_{#1}}
+\newcommand{\SymDecrypt}[1]{\mathsf{Sym.}\mathtt{Decrypt}_{#1}}
 \newcommand{\SymSpecific}{\mathsf{AEAD\_CHACHA20\_POLY1305}}
 \newcommand{\SymCipher}{\mathsf{ChaCha20}}
 \newcommand{\SymAuth}{\mathsf{Poly1305}}