diff --git a/include/zenkit/Archive.hh b/include/zenkit/Archive.hh
index da1c06bb..daeed18d 100644
--- a/include/zenkit/Archive.hh
+++ b/include/zenkit/Archive.hh
@@ -14,6 +14,7 @@
 
 #include <memory>
 #include <string>
+#include <unordered_map>
 #include <variant>
 
 namespace phoenix {