diff --git a/src/huffman.cr b/src/huffman.cr
index 96f4329..26aeff8 100644
--- a/src/huffman.cr
+++ b/src/huffman.cr
@@ -1,6 +1,6 @@
 require "./priority_queue"
 
-class HuffmanNode
+struct HuffmanNode
   def initialize(weight : Int32, children : Array(HuffmanNode))
     @weight = weight
     @children = children