diff --git a/mm/nommu.c b/mm/nommu.c
index b571ef7..2fd2ad5 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -69,6 +69,9 @@
 int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS;
 int heap_stack_gap = 0;
 
+/* amount of vm to protect from userspace access */
+unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
+
 atomic_long_t mmap_pages_allocated;
 
 EXPORT_SYMBOL(mem_map);