diff --git a/Utilities/octree/CMakeLists.txt b/Utilities/octree/CMakeLists.txt
index 3fbeb3ac57c32c40ae45a4cd94a60a3769e3facb..23a06ae75f83cc48ffe02d84d7bc8c1f49eb5f3a 100644
--- a/Utilities/octree/CMakeLists.txt
+++ b/Utilities/octree/CMakeLists.txt
@@ -11,6 +11,6 @@ set(headers
 vtk_module_add_module(VTK::octree
   TEMPLATE_CLASSES ${template_classes}
   HEADERS ${headers}
-  HEADERS_SUBDIR "octree"
+  HEADER_DIRECTORIES
   HEADER_ONLY
   EXCLUDE_HEADER_TEST)