diff --git a/source/graphics/Unit.cpp b/source/graphics/Unit.cpp
index f34a80a4f0..69b4dda41c 100644
--- a/source/graphics/Unit.cpp
+++ b/source/graphics/Unit.cpp
@@ -2,6 +2,7 @@
 
 #include "Unit.h"
 #include "Model.h"
+#include "ObjectBase.h"
 #include "ObjectEntry.h"
 #include "ObjectManager.h"
 #include "SkeletonAnim.h"