diff --git a/src/suou/__init__.py b/src/suou/__init__.py
index b56f3eb..9b2f722 100644
--- a/src/suou/__init__.py
+++ b/src/suou/__init__.py
@@ -27,7 +27,7 @@ from .itertools import makelist, kwargs_prefix, ltuple, rtuple, additem
 from .i18n import I18n, JsonI18n, TomlI18n
 from .snowflake import Snowflake, SnowflakeGen
 
-__version__ = "0.3.0"
+__version__ = "0.3.1"
 
 __all__ = (
     'Siq', 'SiqCache', 'SiqType', 'SiqGen', 'StringCase',
diff --git a/src/suou/snowflake.py b/src/suou/snowflake.py
index e9f2708..06ea85e 100644
--- a/src/suou/snowflake.py
+++ b/src/suou/snowflake.py
@@ -131,7 +131,9 @@ class Snowflake(int):
     def to_oct(self) -> str:
         return f'{self:o}'
     def to_b32l(self) -> str:
-        """PSA Snowflake Base32 representations are padded to 10 bytes!"""
+        # PSA Snowflake Base32 representations are padded to 10 bytes!
+        if self < 0:
+            return '_' + Snowflake.to_b32l(-self)
         return b32lencode(self.to_bytes(10, 'big')).lstrip('a')
 
     @classmethod