diff --git a/cronjob/chart/image_file/image_data.c b/cronjob/chart/image_file/image_data.c
index 0f3accd..805b9a5 100644
--- a/cronjob/chart/image_file/image_data.c
+++ b/cronjob/chart/image_file/image_data.c
@@ -326,7 +326,7 @@ pix_list_ptr get_pix_list(int c_width){
   }
 
   /* Anfrage zusammenbauen */
-  snprintf(query, BUFFSIZE, "SELECT round(date_part('epoch', current_timestamp))::int4 AS now, round(date_part('epoch', timestamp))::int4 AS times, %s AS val FROM %s WHERE sens_id=%d AND  timestamp > (current_timestamp - INTERVAL '%d seconds') ORDER BY times ASC", img_cfg.table_field, table, img_cfg.sens_id, img_cfg.show_interval );
+  snprintf(query, BUFFSIZE, "SELECT round(date_part('epoch', current_timestamp))::int4 AS now, round(date_part('epoch', timestamp))::int4 AS times, %s AS val FROM %s WHERE sens_id=%d AND  timestamp > (select (current_timestamp - INTERVAL '%d seconds')) ORDER BY times ASC", img_cfg.table_field, table, img_cfg.sens_id, img_cfg.show_interval );
 
   /* Anfrage stellen */
   res = pg_check_exec(conn, query, 1);
diff --git a/cronjob/checksensor/checksensor.c b/cronjob/checksensor/checksensor.c
index 4d07e62..a39f586 100644
--- a/cronjob/checksensor/checksensor.c
+++ b/cronjob/checksensor/checksensor.c
@@ -164,7 +164,7 @@ static int count_data_by_sensor_id(PGconn *connection, int sens_id){
 
   table = get_type_table_by_id(connection, sens_id);
 
-  snprintf(query_buff, BUFFSIZE, "SELECT count(sens_id) as num FROM %s WHERE sens_id=%d AND timestamp>(current_timestamp - INTERVAL '%d hours')",table, sens_id, global_opts.interval);
+  snprintf(query_buff, BUFFSIZE, "SELECT count(sens_id) as num FROM %s WHERE sens_id=%d AND timestamp>(select (current_timestamp - INTERVAL '%d hours'))",table, sens_id, global_opts.interval);
   count_res = pg_check_exec(connection, query_buff);
   
   if(PQntuples(count_res) < 1)