diff --git a/package/arm/config.default b/package/arm/config.default
index e7f8786e9..e824f926f 100644
--- a/package/arm/config.default
+++ b/package/arm/config.default
@@ -912,7 +912,7 @@ CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
 CONFIG_HAVE_FAST_GUP=y
 CONFIG_ARCH_KEEP_MEMBLOCK=y
 CONFIG_MEMORY_ISOLATION=y
-# CONFIG_MEMORY_HOTPLUG is not set
+CONFIG_MEMORY_HOTPLUG=y
 CONFIG_SPLIT_PTLOCK_CPUS=4
 CONFIG_MEMORY_BALLOON=y
 CONFIG_BALLOON_COMPACTION=y