diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 35a2d93b3528f1cbcd1b81f205ba5521b61f8333..7cbdada51049738f4bd105f88f1ca0956daa390f 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -33,7 +33,7 @@
 
 
 #ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT	6
+#define RADIX_TREE_MAP_SHIFT	(CONFIG_BASE_SMALL ? 4 : 6)
 #else
 #define RADIX_TREE_MAP_SHIFT	3	/* For more stressful testing */
 #endif