diff --git a/lib/btree.c b/lib/btree.c
index 2a34392..e5ec1e9 100644
--- a/lib/btree.c
+++ b/lib/btree.c
@@ -357,6 +357,7 @@
 	}
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(btree_get_prev);
 
 static int getpos(struct btree_geo *geo, unsigned long *node,
 		unsigned long *key)