diff --git a/setup/migrate.py b/setup/migrate.py
index 94bea923..3d76aabc 100755
--- a/setup/migrate.py
+++ b/setup/migrate.py
@@ -190,6 +190,13 @@ def migration_14(env):
 	db = os.path.join(env["STORAGE_ROOT"], 'mail/users.sqlite')
 	shell("check_call", ["sqlite3", db, "CREATE TABLE auto_aliases (id INTEGER PRIMARY KEY AUTOINCREMENT, source TEXT NOT NULL UNIQUE, destination TEXT NOT NULL, permitted_senders TEXT);"])
 
+def migration_15(env):
+	# Add a column to the users table to store their quota limit.  Default to '0' for unlimited.
+	db = os.path.join(env["STORAGE_ROOT"], 'mail/users.sqlite')
+	shell("check_call", ["sqlite3", db,
+						 "ALTER TABLE users ADD COLUMN quota TEXT NOT NULL DEFAULT '0';"])
+
+
 ###########################################################
 
 def get_current_migration():