diff --git a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
index fc359c5..216e7e4 100644
--- a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
+++ b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
@@ -45,7 +45,7 @@
 echo Remaining mounts:
 cat /proc/mounts
 
-test "umount_proc" && umount /proc && rmdir /proc
+test "$umount_proc" && umount /proc && rmdir /proc
 
 # ioctl(TIOC_DRAIN) to drain tty messages to console
 test -t 1 && stty cooked 0<&1