diff --git a/tests/routers/data/counts_utf8_encoded.csv b/tests/routers/data/counts_utf8_encoded.csv
new file mode 100644
index 000000000..ed263ef25
--- /dev/null
+++ b/tests/routers/data/counts_utf8_encoded.csv
@@ -0,0 +1,4 @@
+hgvs_nt,hgvs_pro,c_0,c_1
+c.1A>T,p.Thr1Ser,10,20
+c.2C>T,p.Thr1Met,8,8
+c.6T>A,p.Phe2Leu,90,2
\ No newline at end of file
diff --git a/tests/routers/data/scores_utf8_encoded.csv b/tests/routers/data/scores_utf8_encoded.csv
new file mode 100644
index 000000000..f96268444
--- /dev/null
+++ b/tests/routers/data/scores_utf8_encoded.csv
@@ -0,0 +1,4 @@
+hgvs_nt,hgvs_pro,score
+c.1A>T,p.Thr1Ser,0.3
+c.2C>T,p.Thr1Met,0
+c.6T>A,p.Phe2Leu,-1.65
\ No newline at end of file
diff --git a/tests/routers/test_score_set.py b/tests/routers/test_score_set.py
index 44207f97d..0c6eef6db 100644
--- a/tests/routers/test_score_set.py
+++ b/tests/routers/test_score_set.py
@@ -336,6 +336,59 @@ def test_add_score_set_variants_scores_and_counts_endpoint(session, client, setu
     assert score_set == response_data
 
 
+def test_add_score_set_variants_scores_only_endpoint_utf8_encoded(client, setup_router_db, data_files):
+    experiment = create_experiment(client)
+    score_set = create_seq_score_set(client, experiment["urn"])
+    scores_csv_path = data_files / "scores_utf8_encoded.csv"
+    with (
+        open(scores_csv_path, "rb") as scores_file,
+        patch.object(ArqRedis, "enqueue_job", return_value=None) as queue,
+    ):
+        response = client.post(
+            f"/api/v1/score-sets/{score_set['urn']}/variants/data",
+            files={"scores_file": (scores_csv_path.name, scores_file, "text/csv")},
+        )
+        queue.assert_called_once()
+
+    assert response.status_code == 200
+    response_data = response.json()
+    jsonschema.validate(instance=response_data, schema=ScoreSet.schema())
+
+    # We test the worker process that actually adds the variant data separately. Here, we take it as
+    # fact that it would have succeeded.
+    score_set.update({"processingState": "processing"})
+    assert score_set == response_data
+
+
+def test_add_score_set_variants_scores_and_counts_endpoint_utf8_encoded(session, client, setup_router_db, data_files):
+    experiment = create_experiment(client)
+    score_set = create_seq_score_set(client, experiment["urn"])
+    scores_csv_path = data_files / "scores_utf8_encoded.csv"
+    counts_csv_path = data_files / "counts_utf8_encoded.csv"
+    with (
+        open(scores_csv_path, "rb") as scores_file,
+        open(counts_csv_path, "rb") as counts_file,
+        patch.object(ArqRedis, "enqueue_job", return_value=None) as queue,
+    ):
+        response = client.post(
+            f"/api/v1/score-sets/{score_set['urn']}/variants/data",
+            files={
+                "scores_file": (scores_csv_path.name, scores_file, "text/csv"),
+                "counts_file": (counts_csv_path.name, counts_file, "text/csv"),
+            },
+        )
+        queue.assert_called_once()
+
+    assert response.status_code == 200
+    response_data = response.json()
+    jsonschema.validate(instance=response_data, schema=ScoreSet.schema())
+
+    # We test the worker process that actually adds the variant data separately. Here, we take it as
+    # fact that it would have succeeded.
+    score_set.update({"processingState": "processing"})
+    assert score_set == response_data
+
+
 def test_cannot_add_scores_to_score_set_without_email(session, client, setup_router_db, data_files):
     experiment = create_experiment(client)
     score_set = create_seq_score_set(client, experiment["urn"])