diff --git a/crates/mitex/tests/cvt/misc.rs b/crates/mitex/tests/cvt/misc.rs
index ecec10b..ad318da 100644
--- a/crates/mitex/tests/cvt/misc.rs
+++ b/crates/mitex/tests/cvt/misc.rs
@@ -83,7 +83,7 @@ fn test_convert_space() {
 
 #[test]
 fn test_convert_escape() {
-    assert_snapshot!(convert_math(r#"$\|x\|| \& \# \% \$ y$"#).unwrap(), @"|| x || |  amp  hash  percent  dollar  y "
+    assert_snapshot!(convert_math(r#"$\|x\|| \& \# \% \$ y$"#).unwrap(), @"|| x || |  amp  hash  %  dollar  y "
     );
     assert_snapshot!(convert_math(r#"$a*b * c$"#).unwrap(), @r###"a \*b  \* c "###
     );
diff --git a/packages/mitex/specs/latex/standard.typ b/packages/mitex/specs/latex/standard.typ
index a31cdfd..f10e7b3 100644
--- a/packages/mitex/specs/latex/standard.typ
+++ b/packages/mitex/specs/latex/standard.typ
@@ -107,7 +107,9 @@
   "|": define-sym("||"),
   "&": define-sym("amp"),
   "#": define-sym("hash"),
-  "%": define-sym("percent"),
+  "%": define-sym("%"),
+  "-": define-sym("-"),
+  "+": define-sym("+"),
   "$": define-sym("dollar"),
   "{": define-sym("\\{"),
   "}": define-sym("\\}"),