diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index 0e585f796..3cd841484 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -469,31 +469,23 @@ def extract_dep(url, filename):
             raise RuntimeError(ex)
 
     print("Extracting " + filename)
+    sources_dir_abs = os.path.abspath(sources_dir)
     if filename.endswith(".zip"):
         with zipfile.ZipFile(file) as zf:
+            for member in zf.namelist():
+                member_abspath = os.path.abspath(os.path.join(sources_dir, member))
+                member_prefix = os.path.commonprefix([sources_dir_abs, member_abspath])
+                if sources_dir_abs != member_prefix:
+                    raise RuntimeError("Attempted Path Traversal in Zip File")
             zf.extractall(sources_dir)
     elif filename.endswith(".tar.gz") or filename.endswith(".tgz"):
         with tarfile.open(file, "r:gz") as tgz:
-            def is_within_directory(directory, target):
-
-                abs_directory = os.path.abspath(directory)
-                abs_target = os.path.abspath(target)
-
-                prefix = os.path.commonprefix([abs_directory, abs_target])
-
-                return prefix == abs_directory
-
-            def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
-
-                for member in tar.getmembers():
-                    member_path = os.path.join(path, member.name)
-                    if not is_within_directory(path, member_path):
-                        raise Exception("Attempted Path Traversal in Tar File")
-
-                tar.extractall(path, members, numeric_owner=numeric_owner)
-
-
-            safe_extract(tgz, sources_dir)
+            for member in tgz.getmembers():
+                member_abspath = os.path.abspath(os.path.join(sources_dir, member.name))
+                member_prefix = os.path.commonprefix([sources_dir_abs, member_abspath])
+                if sources_dir_abs != member_prefix:
+                    raise RuntimeError("Attempted Path Traversal in Tar File")
+            tgz.extractall(sources_dir)
     else:
         raise RuntimeError("Unknown archive type: " + filename)