diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 660a73b6af90..32aad1b02b01 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1918,7 +1918,7 @@ static vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
 		if (reserved_space < fsize) {
 			end = page_start + reserved_space - 1;
 			btrfs_delalloc_release_space(BTRFS_I(inode),
-					data_reserved, page_start,
+					data_reserved, end + 1,
 					fsize - reserved_space, true);
 		}
 	}