diff --git a/fs/dax.c b/fs/dax.c
index e48d68902a8c..5d2e9b10030e 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -2027,8 +2027,8 @@ int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
 
 	while ((ret = iomap_iter(&src_iter, ops)) > 0 &&
 	       (ret = iomap_iter(&dst_iter, ops)) > 0) {
-		compared = dax_range_compare_iter(&src_iter, &dst_iter, len,
-						  same);
+		compared = dax_range_compare_iter(&src_iter, &dst_iter,
+				min(src_iter.len, dst_iter.len), same);
 		if (compared < 0)
 			return ret;
 		src_iter.processed = dst_iter.processed = compared;