diff --git a/zotero2readwise/zotero.py b/zotero2readwise/zotero.py
index f4a9726..54e11e8 100644
--- a/zotero2readwise/zotero.py
+++ b/zotero2readwise/zotero.py
@@ -46,7 +46,7 @@ def __post_init__(self):
             et_al = "et al."
             max_length = 1024 - len(et_al)
             creators_str = ", ".join(self.creators)
-            if creators_str > max_length:
+            if len(creators_str) > max_length:
                 # Reset creators_str and find the first n creators that fit in max_length
                 creators_str = ""
                 while self.creators and len(creators_str) < max_length: