diff --git a/unpacked/jax/input/AsciiMath/config.js b/unpacked/jax/input/AsciiMath/config.js
index 0a51fa855..94f4e473a 100644
--- a/unpacked/jax/input/AsciiMath/config.js
+++ b/unpacked/jax/input/AsciiMath/config.js
@@ -33,7 +33,7 @@ MathJax.InputJax.AsciiMath = MathJax.InputJax({
   
   config: {
     displaystyle: true,               // put limits above and below operators
-    decimal: "."                      // can change to "," but watch out for "(1,2)"
+    decimalsign: "."                  // can change to "," but watch out for "(1,2)"
   }
 });
 MathJax.InputJax.AsciiMath.Register("math/asciimath");
diff --git a/unpacked/jax/input/AsciiMath/jax.js b/unpacked/jax/input/AsciiMath/jax.js
index 18d79257f..eb32db3bc 100644
--- a/unpacked/jax/input/AsciiMath/jax.js
+++ b/unpacked/jax/input/AsciiMath/jax.js
@@ -1193,7 +1193,9 @@ ASCIIMATH.Augment({
   AM: {
     Init: function () {
       displaystyle = ASCIIMATH.config.displaystyle;
-      decimalsign  = ASCIIMATH.config.decimal;
+      // Old versions use the "decimal" option, so take it into account if it
+      // is defined by the user. See issue 384.
+      decimalsign  = (ASCIIMATH.config.decimal || ASCIIMATH.config.decimalsign);
       INITASCIIMATH();
       AMinitSymbols();
     },