diff --git a/configs/arcbox-arm64.config b/configs/arcbox-arm64.config
index 241fcfd..96a53f6 100644
--- a/configs/arcbox-arm64.config
+++ b/configs/arcbox-arm64.config
@@ -94,6 +94,7 @@ CONFIG_MEMORY_HOTPLUG=y
 CONFIG_TRANSPARENT_HUGEPAGE=y
 CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
 CONFIG_COMPACTION=y
+# CONFIG_COMPAT_BRK is not set
 
 # Networking
 CONFIG_NET=y