diff --git a/src/alpine_bits_python/db.py b/src/alpine_bits_python/db.py
index ce82c23..d8c4b6f 100644
--- a/src/alpine_bits_python/db.py
+++ b/src/alpine_bits_python/db.py
@@ -45,7 +45,7 @@ class Reservation(Base):
     id = Column(Integer, primary_key=True)
     customer_id = Column(Integer, ForeignKey("customers.id"))
     unique_id = Column(String, unique=True)
-    md5_unique_id = Column(String, unique=True)  # max length 35
+    md5_unique_id = Column(String(32), unique=True)  # max length 32 guaranteed
     start_date = Column(Date)
     end_date = Column(Date)
     num_adults = Column(Integer)