diff --git a/bio2zarr/vcf2zarr/icf.py b/bio2zarr/vcf2zarr/icf.py
index dd0bbc91..0f3f8566 100644
--- a/bio2zarr/vcf2zarr/icf.py
+++ b/bio2zarr/vcf2zarr/icf.py
@@ -41,7 +41,7 @@ def fromdict(d):
         return VcfFieldSummary(**d)
 
 
-@dataclasses.dataclass
+@dataclasses.dataclass(order=True)
 class VcfField:
     category: str
     name: str
@@ -192,6 +192,16 @@ def fromdict(d):
         d["contigs"] = [Contig(**cd) for cd in d["contigs"]]
         return IcfMetadata(**d)
 
+    def __eq__(self, other):
+        if not isinstance(other, IcfMetadata):
+            return NotImplemented
+        return (
+            self.samples == other.samples
+            and self.contigs == other.contigs
+            and self.filters == other.filters
+            and sorted(self.fields) == sorted(other.fields)
+        )
+
 
 def fixed_vcf_field_definitions():
     def make_field_def(name, vcf_type, vcf_number):
diff --git a/pyproject.toml b/pyproject.toml
index 0b72ca1c..ecb3f60c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
   # colouredlogs pulls in humanfriendly",
   "cyvcf2",
   "bed_reader",
+  "packaging",
 ]
 requires-python = ">=3.9"
 classifiers = [
diff --git a/tests/data/vcf/out_of_order_fields/input1.bcf b/tests/data/vcf/out_of_order_fields/input1.bcf
new file mode 100644
index 00000000..5d0f42de
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diff --git a/tests/data/vcf/out_of_order_fields/input1.bcf.csi b/tests/data/vcf/out_of_order_fields/input1.bcf.csi
new file mode 100644
index 00000000..b10a1267
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diff --git a/tests/data/vcf/out_of_order_fields/input2.bcf b/tests/data/vcf/out_of_order_fields/input2.bcf
new file mode 100644
index 00000000..ee8c4a32
Binary files /dev/null and b/tests/data/vcf/out_of_order_fields/input2.bcf differ
diff --git a/tests/data/vcf/out_of_order_fields/input2.bcf.csi b/tests/data/vcf/out_of_order_fields/input2.bcf.csi
new file mode 100644
index 00000000..51503336
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diff --git a/tests/test_core.py b/tests/test_core.py
index 3607578f..62f76b88 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -237,8 +237,8 @@ def test_examples(self, chunk_size, size, start, stop):
         # It works in CI on Linux, but it'll probably break at some point.
         # It's also necessary to update these numbers each time a new data
         # file gets added
-        ("tests/data", 4976329),
-        ("tests/data/vcf", 4964192),
+        ("tests/data", 4981734),
+        ("tests/data/vcf", 4969597),
         ("tests/data/vcf/sample.vcf.gz", 1089),
     ],
 )
diff --git a/tests/test_vcf_examples.py b/tests/test_vcf_examples.py
index 64e3b26e..f5609153 100644
--- a/tests/test_vcf_examples.py
+++ b/tests/test_vcf_examples.py
@@ -1100,3 +1100,58 @@ def test_missing_filter(tmp_path):
     zarr_path = tmp_path / "zarr"
     with pytest.raises(ValueError, match="Filter 'q10' was not defined in the header"):
         vcf2zarr.convert([path], zarr_path)
+
+
+class TestOutOfOrderFields:
+    # Mixing on purpose
+    data_path1 = "tests/data/vcf/out_of_order_fields/input2.bcf"
+    data_path2 = "tests/data/vcf/out_of_order_fields/input1.bcf"
+
+    @pytest.fixture(scope="class")
+    def ds(self, tmp_path_factory):
+        out = tmp_path_factory.mktemp("data") / "ooo_example.vcf.zarr"
+        vcf2zarr.convert([self.data_path1, self.data_path2], out)
+        return sg.load_dataset(out)
+
+    def test_filters(self, ds):
+        nt.assert_array_equal(ds["filter_id"], ["PASS", "FAIL"])
+        nt.assert_array_equal(
+            ds["variant_filter"],
+            [
+                [True, False],
+                [False, True],
+                [True, False],
+            ],
+        )
+
+    def test_source(self, ds):
+        assert ds.attrs["source"] == f"bio2zarr-{provenance.__version__}"
+
+    def test_contigs(self, ds):
+        nt.assert_array_equal(ds["contig_id"], ["chr20", "chr21"])
+        nt.assert_array_equal(ds["contig_length"], [64444167.0, 46709983.0])
+        nt.assert_array_equal(ds["variant_contig"], [0, 1, 1])
+
+    def test_position(self, ds):
+        nt.assert_array_equal(ds["variant_position"], [63971, 64506, 64507])
+
+    def test_length(self, ds):
+        nt.assert_array_equal(ds["variant_length"], [11, 1, 1])
+
+    def test_info_fields(self, ds):
+        nt.assert_array_equal(
+            ds["variant_QNAME"],
+            ["cluster19_000000F", ".", "cluster19_000000F"],
+        )
+        nt.assert_array_equal(ds["variant_QSTART"], [25698928, 25698928, -1])
+
+    def test_allele(self, ds):
+        nt.assert_array_equal(
+            ds["variant_allele"].values.tolist(),
+            [["TTCCATTCCAC", "T"], ["C", "CTCCAT"], ["G", "A"]],
+        )
+        assert ds["variant_allele"].dtype == "O"
+
+    def test_call_DPs(self, ds):
+        nt.assert_array_equal(ds["call_DP"], [[5], [-1], [5]])
+        nt.assert_array_equal(ds["call_DP2"], [[1], [1], [-1]])