1 files changed, 4 insertions, 3 deletions

diff --git a/archival/libunarchive/unpack_ar_archive.c b/archival/libunarchive/unpack_ar_archive.c
index dc2eec223..300d10e48 100644
--- a/archival/libunarchive/unpack_ar_archive.c
+++ b/archival/libunarchive/unpack_ar_archive.c
@@ -5,16 +5,17 @@
 
 #include "libbb.h"
 #include "unarchive.h"
+#include "ar.h"
 
 void FAST_FUNC unpack_ar_archive(archive_handle_t *ar_archive)
 {
         char magic[7];
 
-        xread(ar_archive->src_fd, magic, 7);
-        if (strncmp(magic, "!<arch>", 7) != 0) {
+        xread(ar_archive->src_fd, magic, AR_MAGIC_LEN);
+        if (strncmp(magic, AR_MAGIC, AR_MAGIC_LEN) != 0) {
                 bb_error_msg_and_die("invalid ar magic");
         }
-        ar_archive->offset += 7;
+        ar_archive->offset += AR_MAGIC_LEN;
 
         while (get_header_ar(ar_archive) == EXIT_SUCCESS)
                 continue;