diff --git a/Source/CesiumRuntime/Private/CesiumEncodedMetadataConversions.h b/Source/CesiumRuntime/Private/CesiumEncodedMetadataConversions.h
index eb38ca9db..09ad5fb60 100644
--- a/Source/CesiumRuntime/Private/CesiumEncodedMetadataConversions.h
+++ b/Source/CesiumRuntime/Private/CesiumEncodedMetadataConversions.h
@@ -2,6 +2,7 @@
 
 #pragma once
 
+#include "HAL/Platform.h"
 #include <gsl/span>
 
 enum class ECesiumMetadataType : uint8;