diff --git a/recipes-phosphor/sensors/phosphor-hwmon/start_hwmon.sh b/recipes-phosphor/sensors/phosphor-hwmon/start_hwmon.sh
index cde0f96..cf72528 100755
--- a/recipes-phosphor/sensors/phosphor-hwmon/start_hwmon.sh
+++ b/recipes-phosphor/sensors/phosphor-hwmon/start_hwmon.sh
@@ -17,6 +17,7 @@
     fi
 fi
 
-path="${path//:/--}"
+path="${path//-/\\x2d}"
+path="${path//:/\\x3a}"
 
 systemctl $action 'xyz.openbmc_project.Hwmon@'$path'.service'
diff --git a/recipes-phosphor/sensors/phosphor-hwmon/xyz.openbmc_project.Hwmon@.service b/recipes-phosphor/sensors/phosphor-hwmon/xyz.openbmc_project.Hwmon@.service
index 9d3e263..b930b57 100644
--- a/recipes-phosphor/sensors/phosphor-hwmon/xyz.openbmc_project.Hwmon@.service
+++ b/recipes-phosphor/sensors/phosphor-hwmon/xyz.openbmc_project.Hwmon@.service
@@ -5,6 +5,6 @@
 
 [Service]
 Restart=on-failure
-ExecStart=/usr/bin/env phosphor-hwmon-readd -o %f
+ExecStart=/usr/bin/env phosphor-hwmon-readd -o %I
 SyslogIdentifier=phosphor-hwmon-readd
 EnvironmentFile=/etc/default/obmc/hwmon/%I.conf