diff --git a/pg_perfbench/db_operations/conn_tasks/local.py b/pg_perfbench/db_operations/conn_tasks/local.py
index 252407c..d179cad 100644
--- a/pg_perfbench/db_operations/conn_tasks/local.py
+++ b/pg_perfbench/db_operations/conn_tasks/local.py
@@ -11,7 +11,7 @@ def __init__(self, db_conf, conn, logger):
     async def stop_db(self):
         try:
             res = await self.conn.run_command(
-                f"su - postgres -c '{self.pg_bin_path}/pg_ctl stop -D {self.pg_data_path}'"
+                f"{self.pg_bin_path}/pg_ctl stop -D {self.pg_data_path}"
             )
             return res
         except Exception as e:
@@ -21,7 +21,7 @@ async def stop_db(self):
 
     async def start_db(self):
         res = await self.conn.run_command(
-            f"su - postgres -c '{self.pg_bin_path}/pg_ctl start -D {self.pg_data_path}'"
+            f"{self.pg_bin_path}/pg_ctl start -D {self.pg_data_path}"
         )
         return res