diff --git a/cloud_platform/models/cloud_platform.py b/cloud_platform/models/cloud_platform.py
index a7bf6a7..f3361ec 100644
--- a/cloud_platform/models/cloud_platform.py
+++ b/cloud_platform/models/cloud_platform.py
@@ -190,7 +190,7 @@ class CloudPlatform(models.AbstractModel):
             )
 
             prefix = os.environ['ODOO_SESSION_REDIS_PREFIX']
-            assert re.match(r'[a-z]+[a-z0-9]*-odoo-[a-z]+[0-9]*', prefix), (
+            assert re.match(r'[a-z0-9]+-odoo-[a-z0-9]+[0-9]*', prefix), (
                 "ODOO_SESSION_REDIS_PREFIX must match '<client>-odoo-<env>'"
                 ", we got: '%s'" % (prefix,)
             )