diff --git a/src/fetch.h b/src/fetch.h
index 2dec865..a17f73e 100644
--- a/src/fetch.h
+++ b/src/fetch.h
@@ -9,6 +9,7 @@
 #include <fstream>
 #include <regex>
 #include <cstdlib>
+#include <optional>
 
 using json = nlohmann::json;
 
diff --git a/src/package_list.h b/src/package_list.h
index f65dc6f..59a13bc 100644
--- a/src/package_list.h
+++ b/src/package_list.h
@@ -2,7 +2,7 @@
 #define __PACKAGELIST_H__
 
 #include <fstream>
-
+#include <optional>
 #include <nlohmann/json.hpp>
 
 #include "package.h"