diff --git a/db/migrate/20180206213435_change_epp_sessions_session_id_to_not_null.rb b/db/migrate/20180206213435_change_epp_sessions_session_id_to_not_null.rb
new file mode 100644
index 000000000..887ef3cb4
--- /dev/null
+++ b/db/migrate/20180206213435_change_epp_sessions_session_id_to_not_null.rb
@@ -0,0 +1,5 @@
+class ChangeEppSessionsSessionIdToNotNull < ActiveRecord::Migration
+  def change
+    change_column_null :epp_sessions, :session_id, false
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index 2cad3e06f..bf3230c57 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -1050,7 +1050,7 @@ ALTER SEQUENCE domains_id_seq OWNED BY domains.id;
 
 CREATE TABLE epp_sessions (
     id integer NOT NULL,
-    session_id character varying,
+    session_id character varying NOT NULL,
     data text,
     created_at timestamp without time zone,
     updated_at timestamp without time zone,
@@ -5070,3 +5070,5 @@ INSERT INTO schema_migrations (version) VALUES ('20180126104536');
 
 INSERT INTO schema_migrations (version) VALUES ('20180126104903');
 
+INSERT INTO schema_migrations (version) VALUES ('20180206213435');
+