diff --git a/target/linux/mediatek/mt7981/base-files/etc/sysctl.d/99-min-free-kbytes.conf b/target/linux/mediatek/mt7981/base-files/etc/sysctl.d/99-min-free-kbytes.conf
new file mode 100644
index 0000000..c64b8b5
--- /dev/null
+++ b/target/linux/mediatek/mt7981/base-files/etc/sysctl.d/99-min-free-kbytes.conf
@@ -0,0 +1,5 @@
+# Do not edit, changes to this file will be lost on upgrades
+# # /etc/sysctl.conf can be used to customize sysctl settings
+
+vm.min_free_kbytes=4096
+