diff --git a/board/common/overlay/etc/init.d/os_conf b/board/common/overlay/etc/init.d/os_conf
index ca0d6fa2ad..e2f6f6fd58 100644
--- a/board/common/overlay/etc/init.d/os_conf
+++ b/board/common/overlay/etc/init.d/os_conf
@@ -1,21 +1,21 @@
 
-SYS_CONF="/etc/os.conf"
-BOOT_CONF="/boot/os.conf"
-DATA_CONF="/data/etc/os.conf"
+_SYS_CONF="/etc/os.conf"
+_BOOT_CONF="/boot/os.conf"
+_DATA_CONF="/data/etc/os.conf"
 
 
 # source in all conf files in order of precedence
-if [[ -f ${SYS_CONF} ]]; then
-    source ${SYS_CONF}
+if [[ -f ${_SYS_CONF} ]]; then
+    source ${_SYS_CONF}
 fi
 
-if [[ -f ${DATA_CONF} ]]; then
-    source ${DATA_CONF}
+if [[ -f ${_DATA_CONF} ]]; then
+    source ${_DATA_CONF}
 fi
 
-if [[ -f ${BOOT_CONF} ]]; then
-    source ${BOOT_CONF}
+if [[ -f ${_BOOT_CONF} ]]; then
+    source ${_BOOT_CONF}
 fi
 
-unset SYS_CONF BOOT_CONF DATA_CONF
+unset _SYS_CONF _BOOT_CONF _DATA_CONF