diff --git a/.clang-tidy b/.clang-tidy
index 1e228494a..a42beebba 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -40,4 +40,6 @@ Checks: >
      mpi-*,
      openmp-*
 
-HeaderFilterRegex: '(/conductivity/|/constants/|/EOS/|/integration/|/interfaces/|/networks/|/neutrinos/|/nse_solver/|/opacity/|/rates/|/screening/|/util/|^\./|^./tmp_build_dir/microphysics_sources/*/).*\.H$'
\ No newline at end of file
+HeaderFilterRegex: '(/conductivity/|/constants/|/EOS/|/integration/|/interfaces/|/networks/|/neutrinos/|/nse_solver/|/opacity/|/rates/|/screening/|/util/|^\./|^./tmp_build_dir/microphysics_sources/*/).*\.H$'
+
+HeaderFileExtensions: ['', "H", 'h', 'hh', 'hpp', 'hxx']