diff --git a/Source/Engine/Core/Types/Nullable.h b/Source/Engine/Core/Types/Nullable.h
index e1aae2ea3..6ca735d08 100644
--- a/Source/Engine/Core/Types/Nullable.h
+++ b/Source/Engine/Core/Types/Nullable.h
@@ -2,6 +2,7 @@
 
 #pragma once
 
+#include "Engine/Core/Templates.h"
 #include "Engine/Platform/Platform.h"
 
 /// <summary>