diff --git a/app/imports/parser/grammar.js b/app/imports/parser/grammar.js
index 8f513674..2ef69a71 100644
--- a/app/imports/parser/grammar.js
+++ b/app/imports/parser/grammar.js
@@ -1,4 +1,4 @@
-// Generated automatically by nearley, version 2.20.1
+// Generated automatically by nearley, version 2.16.0
 // http://github.com/Hardmath123/nearley
 function id(x) { return x[0]; }
 
@@ -93,7 +93,7 @@ let ParserRules = [
         d => [d[2], ...d[3]]
         },
     {"name": "arguments", "symbols": [{"literal":"("}, "_", {"literal":")"}], "postprocess": d => []},
-    {"name": "indexExpression", "symbols": ["arrayExpression", {"literal":"["}, "_", "expression", "_", {"literal":"]"}], "postprocess": d => node.index.create({array: d[0], index: d[3]})},
+    {"name": "indexExpression", "symbols": ["indexExpression", {"literal":"["}, "_", "expression", "_", {"literal":"]"}], "postprocess": d => node.index.create({array: d[0], index: d[3]})},
     {"name": "indexExpression", "symbols": ["arrayExpression"], "postprocess": id},
     {"name": "arrayExpression$subexpression$1", "symbols": ["expression"], "postprocess": d => d[0]},
     {"name": "arrayExpression$ebnf$1", "symbols": []},
diff --git a/app/imports/parser/grammar.ne b/app/imports/parser/grammar.ne
index e008ac54..39407980 100644
--- a/app/imports/parser/grammar.ne
+++ b/app/imports/parser/grammar.ne
@@ -125,7 +125,7 @@ arguments ->
 | "(" _ ")" {% d => [] %}
 
 indexExpression ->
-  arrayExpression "[" _ expression _ "]" {% d => node.index.create({array: d[0], index: d[3]}) %}
+  indexExpression "[" _ expression _ "]" {% d => node.index.create({array: d[0], index: d[3]}) %}
 | arrayExpression {% id %}
 
 arrayExpression ->