diff --git a/scripts/dl_github_archive.py b/scripts/dl_github_archive.py
index 570ed3c6297..9eafaa86971 100755
--- a/scripts/dl_github_archive.py
+++ b/scripts/dl_github_archive.py
@@ -139,7 +139,7 @@ class Path(object):
         if ts is not None:
             args.append('--mtime=@%d' % ts)
         if into.endswith('.zst'):
-            args.append('-I zstd -T0 --ultra -20')
+            args += ['-I', 'zstd -T0 --ultra -20']
         elif into.endswith('.xz'):
             envs['XZ_OPT'] = '-7e'
             args.append('-J')