diff --git a/db_bridge/include/postgresql_db.h b/db_bridge/include/postgresql_db.h
--- a/db_bridge/include/postgresql_db.h
+++ b/db_bridge/include/postgresql_db.h
@@ -6,7 +6,6 @@
 #ifndef POSTGRESQL_DB_H
 #define POSTGRESQL_DB_H
 
-#include <cstdlib>
 #include <iostream>
 #include <abstract_db.h>