diff --git a/scripts/common.py b/scripts/common.py
index 8564968c..f8d359ab 100644
--- a/scripts/common.py
+++ b/scripts/common.py
@@ -1532,8 +1532,8 @@ def expand_platform_declared_names(config: dict, db: dict) -> set[str]:
             md5 = fe.get("md5", "")
             if not md5:
                 continue
-            # Skip multi-hash and zippedFile entries (inner ROM MD5, not file MD5)
-            if "," in md5 or fe.get("zippedFile"):
+            # Skip multi-hash and zipped_file entries (inner ROM MD5, not file MD5)
+            if "," in md5 or fe.get("zipped_file"):
                 continue
             sha1 = by_md5.get(md5.lower())
             if not sha1:
diff --git a/tests/test_platform_keys.py b/tests/test_platform_keys.py
new file mode 100644
index 00000000..c11b8788
--- /dev/null
+++ b/tests/test_platform_keys.py
@@ -0,0 +1,44 @@
+"""Code reads platform entries by the keys the platform YAMLs write.
+
+expand_platform_declared_names skipped archive members through
+`fe.get("zippedFile")`, the upstream Batocera spelling. The YAMLs write
+`zipped_file`, so a member's md5 was taken for a loose file and its name
+counted as declared: 76 Batocera entries added names such as boot0.rom.
+"""
+
+from __future__ import annotations
+
+import re
+import sys
+import unittest
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(REPO_ROOT / "scripts"))
+
+# Where the camelCase key is the upstream format itself: scrapers read it,
+# the Batocera exporter writes it back.
+UPSTREAM_FORMAT = {"scraper", "exporter"}
+
+
+class ZippedFileKey(unittest.TestCase):
+    def test_no_entry_is_read_by_the_upstream_spelling(self):
+        pattern = re.compile(r"""\.get\(\s*["']zippedFile["']|\[\s*["']zippedFile["']\s*\]""")
+        for path in sorted((REPO_ROOT / "scripts").rglob("*.py")):
+            if UPSTREAM_FORMAT & set(path.relative_to(REPO_ROOT / "scripts").parts[:-1]):
+                continue
+            with self.subTest(module=str(path.relative_to(REPO_ROOT))):
+                self.assertIsNone(pattern.search(path.read_text(encoding="utf-8")))
+
+    def test_member_md5_declares_no_loose_name(self):
+        from common import expand_platform_declared_names
+
+        config = {"systems": {"s": {"files": [
+            {"name": "casloopy.zip", "md5": "m1", "zipped_file": "hd6437021.lsi302"},
+        ]}}}
+        db = {"files": {"x": {"name": "boot0.rom"}}, "indexes": {"by_md5": {"m1": "x"}}}
+        self.assertEqual(expand_platform_declared_names(config, db), {"casloopy.zip"})
+
+
+if __name__ == "__main__":
+    unittest.main()