diff --git a/toardb/timeseries/models_contributor.py b/toardb/timeseries/models_contributor.py
index 228f25932f22f48e6ba814f5be177d940a10aa8f..342fb8307dd5e79675e55e9dc8e48567d5b0d65e 100644
--- a/toardb/timeseries/models_contributor.py
+++ b/toardb/timeseries/models_contributor.py
@@ -10,7 +10,7 @@ from toardb.base import Base
 
 
 s1_contributors_table = Table('services.s1_contributors', Base.metadata,
-    Column('request_id', String(32), primary_key=True, nullable=False),
+    Column('request_id', String(36), primary_key=True, nullable=False),
     Column('timeseries_ids',ARRAY(Integer))
 )