diff --git a/CHANGELOG.md b/CHANGELOG.md
index 073a504..759b0cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.3.1
+
+- Fixed bugs in Snowflake generation and serialization of negative values
+
 ## 0.3.0
 
 - Fixed `cb32encode()` and `b32lencode()` doing wrong padding — **UNSOLVED in 0.2.x** which is out of support, effective immediately
diff --git a/src/suou/sqlalchemy.py b/src/suou/sqlalchemy.py
index 2854da6..586ddcb 100644
--- a/src/suou/sqlalchemy.py
+++ b/src/suou/sqlalchemy.py
@@ -86,8 +86,8 @@ def snowflake_column(*, primary_key: bool = True, **kwargs):
         epoch = owner.metadata.info['snowflake_epoch']
         # more arguments will be passed on (?)
         idgen = SnowflakeGen(epoch)
-        def new_id() -> bytes:
-            return idgen.generate()
+        def new_id() -> int:
+            return idgen.generate_one()
         return new_id
     if primary_key:
         return Incomplete(Column, BigInteger, primary_key = True, default = Wanted(new_id_factory), **kwargs)