diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 5608b4f8a27e..5c0c5457268a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4174,7 +4174,7 @@ static int flush_space(struct btrfs_root *root,
 		break;
 	case FLUSH_DELALLOC:
 	case FLUSH_DELALLOC_WAIT:
-		shrink_delalloc(root, num_bytes, orig_bytes,
+		shrink_delalloc(root, num_bytes * 2, orig_bytes,
 				state == FLUSH_DELALLOC_WAIT);
 		break;
 	case ALLOC_CHUNK: