diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8285ed0464fa0645426b38081a9b9cf298eec284..0f425dea4523cca91c680e0684f165cfaaa9ff5f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1693,6 +1693,7 @@ STATIC u64 find_lock_delalloc_range(struct inode *inode,
 		 * shortening the size of the delalloc range we're searching
 		 */
 		free_extent_state(cached_state);
+		cached_state = NULL;
 		if (!loops) {
 			max_bytes = PAGE_CACHE_SIZE;
 			loops = 1;