diff --git a/Source/CesiumRuntime/Private/CesiumEncodedFeaturesMetadata.h b/Source/CesiumRuntime/Private/CesiumEncodedFeaturesMetadata.h
index b1015f4bd..31ec20866 100644
--- a/Source/CesiumRuntime/Private/CesiumEncodedFeaturesMetadata.h
+++ b/Source/CesiumRuntime/Private/CesiumEncodedFeaturesMetadata.h
@@ -29,7 +29,7 @@ struct FCesiumPrimitiveMetadataDescription;
 
 struct FCesiumMetadataPropertyDetails;
 class UMaterialInstanceDynamic;
-enum EMaterialParameterAssociation;
+enum EMaterialParameterAssociation : int;
 
 /**
  * @brief Provides utility for encoding feature IDs from EXT_mesh_features and