diff --git a/extent-tree.c b/extent-tree.c
index e4883903..a89f525c 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -18,6 +18,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include "kerncompat.h"
 #include "radix-tree.h"
 #include "ctree.h"
@@ -3103,7 +3104,8 @@ int btrfs_free_block_groups(struct btrfs_fs_info *info)
 			break;
 		ret = get_state_private(&info->block_group_cache, start, &ptr);
 		if (!ret) {
-			cache = (struct btrfs_block_group_cache *)ptr;
+			cache = (struct btrfs_block_group_cache *)
+					(uintptr_t)ptr;
 			if (cache->free_space_ctl) {
 				btrfs_remove_free_space_cache(cache);
 				kfree(cache->free_space_ctl);