diff --git a/examples/arithmetics.pegjs b/examples/arithmetics.pegjs
index ce56d09..8d05806 100644
--- a/examples/arithmetics.pegjs
+++ b/examples/arithmetics.pegjs
@@ -39,6 +39,6 @@ Factor
 
 Integer "integer"
   = [0-9]+ { return parseInt(text(), 10); }
-
-_ = "whitespace"
-  [ \t\n\r]*
+  
+_ "whitespace"
+  = [ \t\n\r]*