diff --git a/src/humanize/filesize.py b/src/humanize/filesize.py
index fb675fdc..063affe0 100644
--- a/src/humanize/filesize.py
+++ b/src/humanize/filesize.py
@@ -2,9 +2,7 @@
 
 from __future__ import annotations
 
-__lazy_modules__ = {"humanize.i18n", "math"}
-
-from math import log
+__lazy_modules__ = {"humanize.i18n"}
 
 from humanize.i18n import _gettext as _
 
@@ -98,6 +96,8 @@ def naturalsize(
     if abs_bytes < base:
         return f"{int(bytes_)}B" if gnu else _("%d Bytes") % int(bytes_)
 
+    from math import log
+
     exp = int(min(log(abs_bytes, base), len(suffix)))
     # The suffix is chosen from the unrounded byte count, but `format` rounds the
     # mantissa afterward; rounding can push it up to `base` (e.g. 999999 is