diff --git a/tests/test_superblocks.toml b/tests/test_superblocks.toml
index 2dcf8806..f9826a83 100644
--- a/tests/test_superblocks.toml
+++ b/tests/test_superblocks.toml
@@ -48,6 +48,7 @@ code = '''
     tweaked_cfg.block_count = 0;
     lfs_mount(&lfs, &tweaked_cfg) => 0;
     assert(lfs.block_count == cfg->block_count);
+    lfs_unmount(&lfs) => 0;
 '''