diff --git a/tests/funcs/fs.sh b/tests/funcs/fs.sh
index 44ab7791..950e0e7e 100644
--- a/tests/funcs/fs.sh
+++ b/tests/funcs/fs.sh
@@ -400,7 +400,7 @@ t_set_sysfs_mount_option() {
 	local val="$3"
 	local opt="$(t_sysfs_path $nr)/mount_options/$name"
 
-	echo "$val" > "$opt"
+	echo "$val" > "$opt" 2>/dev/null
 }
 
 t_set_all_sysfs_mount_options() {