diff --git a/apps/openmw/mwworld/cellref.hpp b/apps/openmw/mwworld/cellref.hpp
index 3b0c2251b..4db362b1e 100644
--- a/apps/openmw/mwworld/cellref.hpp
+++ b/apps/openmw/mwworld/cellref.hpp
@@ -5,7 +5,7 @@
 
 namespace ESM
 {
-    class ObjectState;
+    struct ObjectState;
 }
 
 namespace MWWorld