diff --git a/src/html_parser.h b/src/html_parser.h
index 056c6e2..50dbc41 100644
--- a/src/html_parser.h
+++ b/src/html_parser.h
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <vector>
+#include <memory>
 
 enum class ElementType {
     TEXT,