diff --git a/.clang-tidy b/.clang-tidy
index 59b4ed1d0..5a739682b 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -45,5 +45,5 @@ Checks: >
   readability-uppercase-literal-suffix,
 
 FormatStyle: "file"
-HeaderFilterRegex: "(contrib|examples|src|scratch|utils)/*/.*h"
+HeaderFilterRegex: ".*(ns|NS).*/(contrib|examples|src|scratch|utils)/*/.*h"
 UseColor: true
diff --git a/utils/tests/gitlab-ci-code-linting.yml b/utils/tests/gitlab-ci-code-linting.yml
index 3a0280a1f..752c719f0 100644
--- a/utils/tests/gitlab-ci-code-linting.yml
+++ b/utils/tests/gitlab-ci-code-linting.yml
@@ -79,7 +79,7 @@ clang-tidy-diff:
     - git fetch upstream master
     - git diff -U0 upstream/master |
       clang-tidy-diff-14.py -path cmake-cache/ -p1 -quiet -use-color
-      -iregex "(contrib|examples|src|scratch|utils)\/.+\.(cpp|cc|cxx|c|h|hpp)"
+      -iregex ".*(ns|NS).*\/(contrib|examples|src|scratch|utils)\/.+\.(cpp|cc|cxx|c|h|hpp)"
       1> $CLANG_TIDY_OUTPUT
       2> /dev/null
     - if egrep -A 3 "file not found \[clang-diagnostic-error\]" $CLANG_TIDY_OUTPUT ; then