diff --git a/.ruff.toml b/.ruff.toml
index b6026f2..eb139a6 100644
--- a/.ruff.toml
+++ b/.ruff.toml
@@ -34,7 +34,7 @@ target-version = "py39"
 # Enable Pyflakes (`F`) and a subset of the pycodestyle (`E`)  codes by default.
 # Unlike Flake8, Ruff doesn't enable pycodestyle warnings (`W`) or
 # McCabe complexity (`C901`) by default.
-select = ["E4", "E7", "E9", "F", "I", "UP", "C4", "SIM"]
+select = ["E4", "E7", "E9", "F", "I", "UP", "C4", "SIM", "PERF"]
 ignore = [
     "E501",  # Line too long
     "E741",  # Ambiguous variable name: `l`
diff --git a/lieer/gmailieer.py b/lieer/gmailieer.py
index 635c9e5..091a816 100755
--- a/lieer/gmailieer.py
+++ b/lieer/gmailieer.py
@@ -862,8 +862,7 @@ def full_pull(self):
             self.bar.total = total
             self.bar_update(len(gids))
 
-            for m in gids:
-                message_gids.append(m["id"])
+            message_gids = [m["id"] for m in gids]
 
             if self.limit is not None and len(message_gids) >= self.limit:
                 break