diff --git a/list.cpp b/list.cpp
index da9ad4f..873dfe9 100644
--- a/list.cpp
+++ b/list.cpp
@@ -12,6 +12,13 @@ struct List
 {
   T value;
   struct List<T> *next;
+
+  ~List()
+  {
+    if (next == NULL)
+      return;
+    delete next;
+  }
 };
 
 template <typename T>