diff --git a/tools/testing/selftests/damon/access_memory.c b/tools/testing/selftests/damon/access_memory.c
index 585a2fa5432956e4f8219e4398357127947cd381..56b17e8fe1be83fe0bdfc7b18a4126cb8fe04f6a 100644
--- a/tools/testing/selftests/damon/access_memory.c
+++ b/tools/testing/selftests/damon/access_memory.c
@@ -35,7 +35,7 @@ int main(int argc, char *argv[])
 		start_clock = clock();
 		while ((clock() - start_clock) * 1000 / CLOCKS_PER_SEC <
 				access_time_ms)
-			memset(regions[i], i, 1024 * 1024 * 10);
+			memset(regions[i], i, sz_region);
 	}
 	return 0;
 }