diff --git a/zerver/data_import/rocketchat.py b/zerver/data_import/rocketchat.py
index 906f0a1182..be0d6e113a 100644
--- a/zerver/data_import/rocketchat.py
+++ b/zerver/data_import/rocketchat.py
@@ -36,6 +36,8 @@ from zerver.lib.upload import sanitize_name
 from zerver.lib.utils import process_list_in_batches
 from zerver.models import Reaction, RealmEmoji, Recipient, UserProfile
 
+bson_codec_options = bson.DEFAULT_CODEC_OPTIONS.with_options(tz_aware=True)
+
 
 def make_realm(
     realm_id: int, realm_subdomain: str, domain_name: str, rc_instance: dict[str, Any]
@@ -976,8 +978,6 @@ def map_user_id_to_user(user_data_list: list[dict[str, Any]]) -> dict[str, dict[
 
 
 def rocketchat_data_to_dict(rocketchat_data_dir: str) -> dict[str, Any]:
-    codec_options = bson.DEFAULT_CODEC_OPTIONS.with_options(tz_aware=True)
-
     rocketchat_data: dict[str, Any] = {}
     rocketchat_data["instance"] = []
     rocketchat_data["user"] = []
@@ -989,60 +989,66 @@ def rocketchat_data_to_dict(rocketchat_data_dir: str) -> dict[str, Any]:
 
     # Get instance
     with open(os.path.join(rocketchat_data_dir, "instances.bson"), "rb") as fcache:
-        rocketchat_data["instance"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["instance"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     # Get user
     with open(os.path.join(rocketchat_data_dir, "users.bson"), "rb") as fcache:
-        rocketchat_data["user"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["user"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     # Get avatar
     with open(os.path.join(rocketchat_data_dir, "rocketchat_avatars.bson"), "rb") as fcache:
-        rocketchat_data["avatar"]["avatar"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["avatar"]["avatar"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     if rocketchat_data["avatar"]["avatar"]:
         with open(
             os.path.join(rocketchat_data_dir, "rocketchat_avatars.files.bson"), "rb"
         ) as fcache:
-            rocketchat_data["avatar"]["file"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["avatar"]["file"] = bson.decode_all(fcache.read(), bson_codec_options)
 
         with open(
             os.path.join(rocketchat_data_dir, "rocketchat_avatars.chunks.bson"), "rb"
         ) as fcache:
-            rocketchat_data["avatar"]["chunk"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["avatar"]["chunk"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     # Get room
     with open(os.path.join(rocketchat_data_dir, "rocketchat_room.bson"), "rb") as fcache:
-        rocketchat_data["room"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["room"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     # Get messages
     with open(os.path.join(rocketchat_data_dir, "rocketchat_message.bson"), "rb") as fcache:
-        rocketchat_data["message"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["message"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     # Get custom emoji
     with open(os.path.join(rocketchat_data_dir, "rocketchat_custom_emoji.bson"), "rb") as fcache:
-        rocketchat_data["custom_emoji"]["emoji"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["custom_emoji"]["emoji"] = bson.decode_all(
+            fcache.read(), bson_codec_options
+        )
 
     if rocketchat_data["custom_emoji"]["emoji"]:
         with open(os.path.join(rocketchat_data_dir, "custom_emoji.files.bson"), "rb") as fcache:
-            rocketchat_data["custom_emoji"]["file"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["custom_emoji"]["file"] = bson.decode_all(
+                fcache.read(), bson_codec_options
+            )
 
         with open(os.path.join(rocketchat_data_dir, "custom_emoji.chunks.bson"), "rb") as fcache:
-            rocketchat_data["custom_emoji"]["chunk"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["custom_emoji"]["chunk"] = bson.decode_all(
+                fcache.read(), bson_codec_options
+            )
 
     # Get uploads
     with open(os.path.join(rocketchat_data_dir, "rocketchat_uploads.bson"), "rb") as fcache:
-        rocketchat_data["upload"]["upload"] = bson.decode_all(fcache.read(), codec_options)
+        rocketchat_data["upload"]["upload"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     if rocketchat_data["upload"]["upload"]:
         with open(
             os.path.join(rocketchat_data_dir, "rocketchat_uploads.files.bson"), "rb"
         ) as fcache:
-            rocketchat_data["upload"]["file"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["upload"]["file"] = bson.decode_all(fcache.read(), bson_codec_options)
 
         with open(
             os.path.join(rocketchat_data_dir, "rocketchat_uploads.chunks.bson"), "rb"
         ) as fcache:
-            rocketchat_data["upload"]["chunk"] = bson.decode_all(fcache.read(), codec_options)
+            rocketchat_data["upload"]["chunk"] = bson.decode_all(fcache.read(), bson_codec_options)
 
     return rocketchat_data