diff --git a/tools/migration/db/util/mysql_pgsql_data_converter.py b/tools/migration/db/util/mysql_pgsql_data_converter.py
index 5a656839f..45e19d353 100644
--- a/tools/migration/db/util/mysql_pgsql_data_converter.py
+++ b/tools/migration/db/util/mysql_pgsql_data_converter.py
@@ -94,8 +94,8 @@ def convert_notary_server_db(mysql_dump_file, pgsql_dump_file):
     
     write_database(pgsql_dump, "notaryserver")
     write_insert(pgsql_dump, insert_lines)
-    alter_sequence(pgsql_dump, "tuf_files", "id")
-    alter_sequence(pgsql_dump, "changefeed", "id")
+    write_sequence(pgsql_dump, "tuf_files", "id")
+    write_sequence(pgsql_dump, "changefeed", "id")
 
 def convert_notary_signer_db(mysql_dump_file, pgsql_dump_file):
     mysql_dump = open(mysql_dump_file)
@@ -116,7 +116,7 @@ def convert_notary_signer_db(mysql_dump_file, pgsql_dump_file):
     
     write_database(pgsql_dump, "notarysigner")
     write_insert(pgsql_dump, insert_lines)
-    alter_sequence(pgsql_dump, "private_keys", "id")
+    write_sequence(pgsql_dump, "private_keys", "id")
 
 def write_database(pgsql_dump, db_name):
     pgsql_dump.write("\\c %s;\n" % db_name)
@@ -145,16 +145,10 @@ def write_alter_table_bool(pgsql_dump, table_name, table_columnn, default_value=
 
 def write_sequence(pgsql_dump, table_name, table_columnn):
     pgsql_dump.write('\n')
-    pgsql_dump.write("CREATE SEQUENCE %s_%s_seq;\n" % (table_name, table_columnn))
+    pgsql_dump.write("CREATE SEQUENCE IF NOT EXISTS %s_%s_seq;\n" % (table_name, table_columnn))
     pgsql_dump.write("SELECT setval('%s_%s_seq', max(%s)) FROM %s;\n" % (table_name, table_columnn, table_columnn, table_name))
     pgsql_dump.write("ALTER TABLE \"%s\" ALTER COLUMN \"%s\" SET DEFAULT nextval('%s_%s_seq');\n" % (table_name, table_columnn, table_name, table_columnn))
 
-def alter_sequence(pgsql_dump, table_name, table_columnn):
-    pgsql_dump.write('\n')
-    pgsql_dump.write("SELECT setval('%s_%s_seq', max(%s)) FROM %s;\n" % (table_name, table_columnn, table_columnn, table_name))
-    pgsql_dump.write("ALTER TABLE \"%s\" ALTER COLUMN \"%s\" SET DEFAULT nextval('%s_%s_seq');\n" % (table_name, table_columnn, table_name, table_columnn))
-
-
 if __name__ == "__main__":
     if sys.argv[1].find("registry") != -1:
         convert_registry_db(sys.argv[1], sys.argv[2])