diff --git a/scripts/exporter/baseline.py b/scripts/exporter/baseline.py
index 6fd86c11..18f8aad5 100644
--- a/scripts/exporter/baseline.py
+++ b/scripts/exporter/baseline.py
@@ -42,6 +42,15 @@ def _field_sets(entry: dict | None) -> dict[str, set[str]]:
     return {f: set(_hash_values(entry or {}, f)) for f in HASH_FIELDS}
 
 
+def _single_size(value: object) -> int | None:
+    """One size, or None: a list names several accepted revisions, which a
+    single size field cannot state (int() on it stopped the whole export)."""
+    if isinstance(value, list):
+        distinct = {int(v) for v in value}
+        return distinct.pop() if len(distinct) == 1 else None
+    return int(value)
+
+
 @dataclass
 class NativeFile:
     """One file as the platform will read it, after correction."""
@@ -147,7 +156,7 @@ class NativeFile:
         order = (self.platform, self.truth) if source == "platform" else (self.truth, self.platform)
         for entry in order:
             if entry and entry.get("size"):
-                return int(entry["size"])
+                return _single_size(entry["size"])
         return None
 
     def native(self, key: str, default: object = "") -> object:
diff --git a/tests/test_export_counts.py b/tests/test_export_counts.py
index 2cc6da75..c59b6959 100644
--- a/tests/test_export_counts.py
+++ b/tests/test_export_counts.py
@@ -196,6 +196,13 @@ class MisterCountsWhatItWrites(unittest.TestCase):
 
 
 class ModelKeepsOneFileOneEntry(unittest.TestCase):
+    def test_a_list_of_sizes_is_not_one_size(self):
+        """A profile may accept several revisions; int() on the list crashed."""
+        several = NativeFile("a.bin", "a.bin", "s", truth={"size": [1024, 2048], "crc32": "aaaaaaaa"})
+        single = NativeFile("b.bin", "b.bin", "s", truth={"size": [1024], "crc32": "aaaaaaaa"})
+        self.assertIsNone(several.size())
+        self.assertEqual(single.size(), 1024)
+
     def test_size_describes_the_hash_written(self):
         fe = NativeFile("boot.bin", "dc/boot.bin", "dc",
                         platform={"size": 2097152, "md5": A}, truth={"size": 480})