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-rw-r--r--login/utmp_file.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/login/utmp_file.c b/login/utmp_file.c
index a0b0aa4346..9a5d687291 100644
--- a/login/utmp_file.c
+++ b/login/utmp_file.c
@@ -231,7 +231,9 @@ proc_utmp_eq (const struct utmp *entry, const struct utmp *match)
      &&
 #endif
 #if _HAVE_UT_ID - 0
-     strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0
+     (entry->ut_id[0] && match->ut_id[0]
+      ? strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0
+      : strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0)
 #else
      strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0
 #endif