diff --git a/src/citra_qt/multiplayer/chat_room.h b/src/citra_qt/multiplayer/chat_room.h
index d73f7cf73..6e739910f 100644
--- a/src/citra_qt/multiplayer/chat_room.h
+++ b/src/citra_qt/multiplayer/chat_room.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <memory>
+#include <unordered_map>
 #include <unordered_set>
 #include <QDialog>
 #include <QSortFilterProxyModel>