diff --git a/apps/opencs/model/world/actoradapter.hpp b/apps/opencs/model/world/actoradapter.hpp
index 2c94f9c2c..09bd2682b 100644
--- a/apps/opencs/model/world/actoradapter.hpp
+++ b/apps/opencs/model/world/actoradapter.hpp
@@ -6,6 +6,7 @@
 #include <utility>
 
 #include <QObject>
+#include <QModelIndex>
 
 #include <components/esm/loadarmo.hpp>
 #include <components/esm/loadbody.hpp>