diff --git a/build/tools/repopick.py b/build/tools/repopick.py
index d5e29f21..08acd82b 100755
--- a/build/tools/repopick.py
+++ b/build/tools/repopick.py
@@ -233,7 +233,7 @@ def main():
     )
     parser.add_argument(
         "change_number",
-        nargs="*",
+        nargs="+",
         help="change number to cherry pick. Use {change number}/{patchset number} to get a specific revision.",
     )
     parser.add_argument(