diff --git a/bio2zarr/vcf_utils.py b/bio2zarr/vcf_utils.py
index 30fc9d3..78690fc 100644
--- a/bio2zarr/vcf_utils.py
+++ b/bio2zarr/vcf_utils.py
@@ -441,9 +441,9 @@ def count_variants(self, region):
         return sum(1 for _ in self.variants(region))
 
     def variants(self, region):
-        # Need to filter because of indels overlapping the region
         start = 1 if region.start is None else region.start
         for var in self.vcf(str(region)):
+            # Need to filter because of indels overlapping the region
             if var.POS >= start:
                 yield var
 
diff --git a/tests/data/vcf/chr_m_indels.vcf.gz b/tests/data/vcf/chr_m_indels.vcf.gz
new file mode 100644
index 0000000..a2510e9
Binary files /dev/null and b/tests/data/vcf/chr_m_indels.vcf.gz differ
diff --git a/tests/data/vcf/chr_m_indels.vcf.gz.csi b/tests/data/vcf/chr_m_indels.vcf.gz.csi
new file mode 100644
index 0000000..25bedd7
Binary files /dev/null and b/tests/data/vcf/chr_m_indels.vcf.gz.csi differ
diff --git a/tests/test_core.py b/tests/test_core.py
index c6e8f45..6fd71f8 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -192,8 +192,8 @@ def test_5_chunk_1(self, n, expected):
         # It *might* work in CI, but it may well not either, as it's
         # probably dependent on a whole bunch of things. Expect to fail
         # at some point.
-        ("tests/data", 4960266),
-        ("tests/data/vcf", 4948129),
+        ("tests/data", 4973315),
+        ("tests/data/vcf", 4961178),
         ("tests/data/vcf/sample.vcf.gz", 1089),
     ],
 )
diff --git a/tests/test_vcf_examples.py b/tests/test_vcf_examples.py
index 07545b1..909efc7 100644
--- a/tests/test_vcf_examples.py
+++ b/tests/test_vcf_examples.py
@@ -837,6 +837,7 @@ def test_duplicate_paths(self, tmp_path):
         "1kg_2020_chrM.vcf.gz",
         "field_type_combos.vcf.gz",
         "out_of_order_contigs.vcf.gz",
+        "chr_m_indels.vcf.gz",
     ],
 )
 def test_by_validating(name, tmp_path):
diff --git a/tests/test_vcf_utils.py b/tests/test_vcf_utils.py
index 4800176..5c1e75f 100644
--- a/tests/test_vcf_utils.py
+++ b/tests/test_vcf_utils.py
@@ -29,6 +29,13 @@ def test_context_manager_error(self):
             with vcf_utils.IndexedVcf(data_path / "no-such-file.bcf"):
                 pass
 
+    def test_indels_filtered(self):
+        with vcf_utils.IndexedVcf(data_path / "chr_m_indels.vcf.gz") as vfile:
+            # Hand-picked example that results in filtering
+            region = vcf_utils.Region("chrM", 300, 314)
+            pos = [var.POS for var in vfile.variants(region)]
+            assert pos == [307, 308, 309, 312, 313, 314]
+
     # values computed using bcftools index -s
     @pytest.mark.parametrize(
         ("index_file", "expected"),
@@ -58,6 +65,7 @@ def test_context_manager_error(self):
             ("1kg_2020_chr20_annotations.bcf.csi", {"chr20": 21}),
             ("NA12878.prod.chr20snippet.g.vcf.gz.tbi", {"20": 301778}),
             ("multi_contig.vcf.gz.tbi", {str(j): 933 for j in range(5)}),
+            ("chr_m_indels.vcf.gz.csi", {"chrM": 155}),
         ],
     )
     def test_contig_record_counts(self, index_file, expected):
@@ -82,6 +90,7 @@ def test_contig_record_counts(self, index_file, expected):
             ("1kg_2020_chr20_annotations.bcf.csi", ["chr20:60070-"]),
             ("NA12878.prod.chr20snippet.g.vcf.gz.tbi", ["20:60001-"]),
             ("multi_contig.vcf.gz.tbi", [f"{j}:1-" for j in range(5)]),
+            ("chr_m_indels.vcf.gz.csi", ["chrM:26-"]),
         ],
     )
     def test_partition_into_one_part(self, index_file, expected):
@@ -106,6 +115,7 @@ def test_partition_into_one_part(self, index_file, expected):
             ("1kg_2020_chr20_annotations.bcf.csi", 1, 21),
             ("NA12878.prod.chr20snippet.g.vcf.gz.tbi", 59, 301778),
             ("multi_contig.vcf.gz.tbi", 5, 5 * 933),
+            ("chr_m_indels.vcf.gz.csi", 1, 155),
         ],
     )
     def test_partition_into_max_parts(self, index_file, num_expected, total_records):