diff --git a/packages/handlebars/parse.js b/packages/handlebars/parse.js
index fa569d56b7..e1c3d72ddb 100644
--- a/packages/handlebars/parse.js
+++ b/packages/handlebars/parse.js
@@ -65,18 +65,20 @@ Handlebars.to_json_ast = function (code) {
   };
 
   var value = function (node) {
-    //Work around handlebars.js Issue #422 - Negative integers for helpers get trapped as ID
-    if (node.type == 'ID' && node.string.slice(0,1) == '-' && !isNaN(node.string)) { //node.string eg. '-10'
-      //Reconstruct node
+    // Work around handlebars.js Issue #422 - Negative integers for
+    // helpers get trapped as ID. handlebars doesn't support floating
+    // point, just integers.
+    if (node.type === 'ID' && /^-\d+$/.test(node.string)) {
+      // Reconstruct node
       node.type = 'INTEGER';
       node.integer = node.string;
-    } //EO Workaround handlebars.js Issue #422
+    }
 
     var choices = {
       ID: function (node) {return identifier(node);},
       STRING: function (node) {return ''+node.string;},
       INTEGER: function (node) {return +node.integer;},
-      BOOLEAN: function (node) {return (node.bool === 'true');},
+      BOOLEAN: function (node) {return (node.bool === 'true');}
     };
     if (!(node.type in choices))
       throw new Error("got ast node " + node.type + " for value");