diff --git a/telethon/utils.py b/telethon/utils.py
index b00644ca..c8991724 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -1235,7 +1235,7 @@ def get_appropriated_part_size(file_size):
         return 128
     if file_size <= 786432000:  # 750MB
         return 256
-    if file_size <= 1572864000:  # 1500MB
+    if file_size <= 2097152000:  # 2000MB
         return 512
 
     raise ValueError('File size too large')