diff --git a/t/unit-tests/t-reftable-block.c b/t/unit-tests/t-reftable-block.c
index 582a8e6036..f0124fc3d0 100644
--- a/t/unit-tests/t-reftable-block.c
+++ b/t/unit-tests/t-reftable-block.c
@@ -359,7 +359,7 @@ static void t_index_block_read_write(void)
 		reftable_record_release(&recs[i]);
 }
 
-int cmd_main(int argc, const char *argv[])
+int cmd_main(int argc UNUSED, const char *argv[] UNUSED)
 {
 	TEST(t_index_block_read_write(), "read-write operations on index blocks work");
 	TEST(t_log_block_read_write(), "read-write operations on log blocks work");