diff --git a/Parallel/Core/CMakeLists.txt b/Parallel/Core/CMakeLists.txt
index c541b723abbb5ae52cc181b05d280bf5f599a838..8c1a1f074958486eba8f484a1fcce9c153a871fe 100644
--- a/Parallel/Core/CMakeLists.txt
+++ b/Parallel/Core/CMakeLists.txt
@@ -33,5 +33,7 @@ vtk_module_add_module(VTK::ParallelCore
   NOWRAP_HEADERS    vtkMultiProcessStreamSerialization.h
   TEMPLATES         ${templates}
   TEMPLATE_CLASSES  ${template_classes}
-  PRIVATE_HEADERS   ${hash_header})
+  PRIVATE_HEADERS   ${hash_header}
+  # This generated header doesn't contain anything with copyright.
+  SPDX_SKIP_REGEX   "vtkSocketCommunicatorHash")
 vtk_add_test_mangling(VTK::ParallelCore)