diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 402eb4e..9927cca 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -151,6 +151,7 @@
 out:
 	return ret;
 }
+EXPORT_SYMBOL(radix_tree_preload);
 
 static inline void tag_set(struct radix_tree_node *node, unsigned int tag,
 		int offset)