diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 83f708e..5ce5a1e 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -70,10 +70,8 @@
 
 #define RADIX_TREE_MAX_TAGS 3
 
-#ifdef __KERNEL__
+#ifndef RADIX_TREE_MAP_SHIFT
 #define RADIX_TREE_MAP_SHIFT	(CONFIG_BASE_SMALL ? 4 : 6)
-#else
-#define RADIX_TREE_MAP_SHIFT	3	/* For more stressful testing */
 #endif
 
 #define RADIX_TREE_MAP_SIZE	(1UL << RADIX_TREE_MAP_SHIFT)