diff --git a/parser.lua b/parser.lua
index 4016e9b..339cf30 100644
--- a/parser.lua
+++ b/parser.lua
@@ -10,7 +10,7 @@ foldr = function(...)
     assert(inner.type)
     local outer = select(i, ...)
     table.insert(outer, 1, inner)
-    inner.start = outer.start
+    outer.source.start = inner.source.start
     inner = outer
   end
   assert(inner.type)
diff --git a/parser.moon b/parser.moon
index 8f75eea..47459b2 100644
--- a/parser.moon
+++ b/parser.moon
@@ -11,7 +11,7 @@ foldr = (...)->
         assert inner.type
         outer = select(i,...)
         table.insert(outer, 1, inner)
-        inner.start = outer.start
+        outer.source.start = inner.source.start
         inner = outer
     assert inner.type
     return inner