diff --git a/update.sh b/update.sh
index bc261ef..f18b86c 100755
--- a/update.sh
+++ b/update.sh
@@ -143,7 +143,7 @@ function update_snap() {
 # Return value: None
 function cleanup_snap() {
   LANG=C snap list --all | awk '/disabled/{print $1, $3}' |
-    while read snapname revision; do
+    while read -r snapname revision; do
         snap remove "$snapname" --revision="$revision"
     done
 }