diff --git a/src/systemd/sd-journal.h b/src/systemd/sd-journal.h
index e21a7184e3..5c5d883b44 100644
--- a/src/systemd/sd-journal.h
+++ b/src/systemd/sd-journal.h
@@ -124,7 +124,7 @@ int sd_journal_get_cursor(sd_journal *j, char **ret_cursor);
 int sd_journal_test_cursor(sd_journal *j, const char *cursor);
 
 int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to);
-int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, const sd_id128_t boot_id, uint64_t *from, uint64_t *to);
+int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to);
 
 int sd_journal_get_usage(sd_journal *j, uint64_t *ret_bytes);