diff --git a/test/units/util.sh b/test/units/util.sh
index 66f9c73ba6..dc5dd1e1ec 100755
--- a/test/units/util.sh
+++ b/test/units/util.sh
@@ -232,7 +232,7 @@ maybe_mount_usr_overlay() {
     if [[ ! -w /usr ]]; then
         mkdir -p /tmp/usr-overlay/{upperdir,workdir}
         mount -t overlay -o lowerdir=/usr,upperdir=/tmp/usr-overlay/upperdir,workdir=/tmp/usr-overlay/workdir overlay /usr
-	MOUNTED_USR_OVERLAY=true
+        MOUNTED_USR_OVERLAY=true
     fi
 }