diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 6d16506bbdc0..d49ce7768f7f 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1717,10 +1717,10 @@ static int check_inode_ref(struct extent_buffer *leaf,
 	while (ptr < end) {
 		u16 namelen;
 
-		if (unlikely(ptr + sizeof(iref) > end)) {
+		if (unlikely(ptr + sizeof(*iref) > end)) {
 			inode_ref_err(leaf, slot,
 			"inode ref overflow, ptr %lu end %lu inode_ref_size %zu",
-				ptr, end, sizeof(iref));
+				ptr, end, sizeof(*iref));
 			return -EUCLEAN;
 		}