Index: usr.bin/ar/write.c
===================================================================
--- usr.bin/ar/write.c
+++ usr.bin/ar/write.c
@@ -656,10 +656,7 @@
 	 *
 	 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 	 */
-
 	w_sz = sizeof(uint32_t);
-	if (bsdar->s_so_max > UINT32_MAX)
-		w_sz = sizeof(uint64_t);
 	if (bsdar->s_cnt != 0) {
 		s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 		pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
@@ -672,15 +669,15 @@
 			s_sz = (bsdar->s_cnt + 1) * sizeof(uint64_t) +
 			    bsdar->s_sn_sz;
 			pm_sz += s_sz;
-		}
-
-		for (i = 0; (size_t)i < bsdar->s_cnt; i++) {
-			if (w_sz == sizeof(uint32_t))
-				*(bsdar->s_so + i) =
-				    htobe32((uint32_t)(*(bsdar->s_so + i)) + pm_sz);
-			else
-				*(bsdar->s_so + i) =
-				    htobe64(*(bsdar->s_so + i) + pm_sz);
+			/* Convert to big-endian. */
+			for (i = 0; (size_t)i < bsdar->s_cnt; i++)
+				bsdar->s_so[i] =
+				    htobe64(bsdar->s_so[i] + pm_sz);
+		} else {
+			/* Convert to big-endian and shuffle to beginning. */
+			for (i = 0; (size_t)i < bsdar->s_cnt; i++)
+				((uint32_t *)(bsdar->s_so))[i] =
+				    htobe32((uint32_t)(bsdar->s_so[i] + pm_sz));
 		}
 	}
 
@@ -716,14 +713,7 @@
 		else
 			nr = htobe64(bsdar->s_cnt);
 		write_data(bsdar, a, &nr, w_sz);
-		if (w_sz == sizeof(uint64_t))
-			write_data(bsdar, a, bsdar->s_so, sizeof(uint64_t) *
-			    bsdar->s_cnt);
-		else
-			for (i = 0; (size_t)i < bsdar->s_cnt; i++)
-				write_data(bsdar, a,
-				    (uint32_t *)&bsdar->s_so[i],
-				    sizeof(uint32_t));
+		write_data(bsdar, a, bsdar->s_so, w_sz * bsdar->s_cnt);
 		write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 		archive_entry_free(entry);
 	}