diff --git a/openwisp_controller/connection/connectors/openwrt/ssh.py b/openwisp_controller/connection/connectors/openwrt/ssh.py
index 56f55339a..4d3a2d4fe 100644
--- a/openwisp_controller/connection/connectors/openwrt/ssh.py
+++ b/openwisp_controller/connection/connectors/openwrt/ssh.py
@@ -24,7 +24,7 @@ def update_config(self):
     def exec_signal_reload(self):
         self.exec_command(
             (
-                'OW_CONFIG_PID=$(ps | grep "openwisp_config" | '
+                'OW_CONFIG_PID=$(ps | grep openwisp | grep config | '
                 'grep -v "grep" | awk \'{print $1}\'); '
                 'kill -SIGUSR1 $OW_CONFIG_PID'
             )