diff --git a/dev/tests/zip_files.lua b/dev/tests/zip_files.lua
index ad5f4e7e0..e7ed664cb 100644
--- a/dev/tests/zip_files.lua
+++ b/dev/tests/zip_files.lua
@@ -86,6 +86,7 @@ local function check_zip(src, zipfile)
 
     debug.log("unmount "..m)
     file.unmount(m)
+    assert(not file.exists(m..":"))
     assert(not pcall(file.read, m..":root.txt"))
     assert(not pcall(file.unmount, m))
 end
diff --git a/src/io/devices/ZipFileDevice.cpp b/src/io/devices/ZipFileDevice.cpp
index 8420e1e1d..f097f77f6 100644
--- a/src/io/devices/ZipFileDevice.cpp
+++ b/src/io/devices/ZipFileDevice.cpp
@@ -182,7 +182,6 @@ ZipFileDevice::ZipFileDevice(
         entries[entry.fileName] = std::move(entry);
     }
 
-    // Add missing parent directories entries
     std::vector<std::string> names;
     names.reserve(entries.size());
     for (const auto& [name, _] : entries) {