diff --git a/fs/remap_range.c b/fs/remap_range.c
index e6099beefa97..e8e00e217d6c 100644
--- a/fs/remap_range.c
+++ b/fs/remap_range.c
@@ -71,7 +71,8 @@ static int generic_remap_checks(struct file *file_in, loff_t pos_in,
 	 * Otherwise, make sure the count is also block-aligned, having
 	 * already confirmed the starting offsets' block alignment.
 	 */
-	if (pos_in + count == size_in) {
+	if (pos_in + count == size_in &&
+	    (!(remap_flags & REMAP_FILE_DEDUP) || pos_out + count == size_out)) {
 		bcount = ALIGN(size_in, bs) - pos_in;
 	} else {
 		if (!IS_ALIGNED(count, bs))