diff --git a/unpacked/jax/input/TeX/jax.js b/unpacked/jax/input/TeX/jax.js
index aa6cdd9bc..64858b8fa 100644
--- a/unpacked/jax/input/TeX/jax.js
+++ b/unpacked/jax/input/TeX/jax.js
@@ -2200,6 +2200,7 @@
       return mrow;
     },
     mathPalette: function (fence,side) {
+      if (fence === '{' || fence === '}') {fence = "\\"+fence}
       var D = '{\\bigg'+side+' '+fence+'}', T = '{\\big'+side+' '+fence+'}';
       return TEX.Parse('\\mathchoice'+D+T+T+T).mml();
     },