diff --git a/cve_bin_tool/util.py b/cve_bin_tool/util.py
index d0865a4f44..6c9d5b247c 100644
--- a/cve_bin_tool/util.py
+++ b/cve_bin_tool/util.py
@@ -364,7 +364,7 @@ def walk(self, roots: list[str] | None = None) -> Iterator[str]:
         for root in roots:
             for dirpath, dirnames, filenames in os.walk(root):
                 # Filters
-                for filename in filenames:
+                for filename in filenames.copy():
                     try:
                         if (
                             not self.pattern_match(