diff --git a/include/lapi/landlock.h b/include/lapi/landlock.h
index 6d85eb12e37..505541f51b0 100644
--- a/include/lapi/landlock.h
+++ b/include/lapi/landlock.h
@@ -131,7 +131,7 @@ static inline int safe_landlock_create_ruleset(const char *file, const int linen
 	rval = tst_syscall(__NR_landlock_create_ruleset, attr, size, flags);
 	if (rval == -1) {
 		tst_brk_(file, lineno, TBROK | TERRNO,
-			"landlock_create_ruleset(%p, %lu, %u)",
+			"landlock_create_ruleset(%p, %zi, %u)",
 			attr, size, flags);
 	}