diff --git a/scripts/ci/test_plan.py b/scripts/ci/test_plan.py
index 6bb9f23b82169..93e7fdd5ea7fb 100755
--- a/scripts/ci/test_plan.py
+++ b/scripts/ci/test_plan.py
@@ -288,8 +288,8 @@ def find_boards(self):
         # be removed from further consideration
         for _, board in matched_boards.items():
             relative_board_dir = str(board.dir.relative_to(zephyr_base))
-            resolved_filter = lambda f, rel_dir=relative_board_dir: rel_dir in f, resolved_files
-            self.resolved_files.extend(list(filter(resolved_filter)))
+            rel_resolved_files = [f for f in resolved_files if relative_board_dir in f]
+            self.resolved_files.extend(rel_resolved_files)
 
         _options = []
         if len(matched_boards) > 20: