diff --git a/src/emitter.js b/src/emitter.js
index d9dc11f..aa7edf2 100644
--- a/src/emitter.js
+++ b/src/emitter.js
@@ -734,10 +734,10 @@ PEG.compiler.emitter = function(ast) {
 
     semantic_not: function(node, context) {
       return formatCode(
-        '#{resultVar} = (function() {#{actionCode}})() ? null : "";',
+        '#{resultVar} = (function() {#{node.code}})() ? null : "";',
         {
-          actionCode: node.code,
-          resultVar:  resultVar(context.resultIndex)
+          node:      node,
+          resultVar: resultVar(context.resultIndex)
         }
       );
     },