diff --git a/src/bin/pg_combinebackup/reconstruct.c b/src/bin/pg_combinebackup/reconstruct.c
index 8748d38d4b6..5000f7be001 100644
--- a/src/bin/pg_combinebackup/reconstruct.c
+++ b/src/bin/pg_combinebackup/reconstruct.c
@@ -695,7 +695,7 @@ write_reconstructed_file(const char *input_filename,
 			 */
 			do
 			{
-				int			wb;
+				ssize_t		wb;
 
 				wb = copy_file_range(s->fd, &off, wfd, NULL, BLCKSZ - nwritten, 0);