1 files changed, 3 insertions, 2 deletions
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index c9b57c2f0..da6f27801 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -2279,8 +2279,9 @@ def format_decimal_suffix(num, fmt='%d%s', *, factor=1000):
     num, factor = float_or_none(num), float(factor)
     if num is None or num < 0:
         return None
-    exponent = 0 if num == 0 else int(math.log(num, factor))
-    suffix = ['', *'kMGTPEZY'][exponent]
+    POSSIBLE_SUFFIXES = 'kMGTPEZY'
+    exponent = 0 if num == 0 else min(int(math.log(num, factor)), len(POSSIBLE_SUFFIXES))
+    suffix = ['', *POSSIBLE_SUFFIXES][exponent]
     if factor == 1024:
         suffix = {'k': 'Ki', '': ''}.get(suffix, f'{suffix}i')
     converted = num / (factor ** exponent)