diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e917c92..a59da172 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -243,3 +243,6 @@
 
 * Point `scripts/run_benchmark/wehi_hpc/run_full_hpc.sh` at `build/main` instead of
   `build/update_ilisi`, and label the seqera full run as `full` instead of `test_subset` (PR #129).
+
+* Fix `average_batch_r2` and `flowsom_mapping_similarity` writing `metric_ids` and `metric_values`
+  as scalars instead of lists, as required by `file_score.yaml` (PR #130).
diff --git a/src/metrics/average_batch_r2/script.py b/src/metrics/average_batch_r2/script.py
index 93fbd620..80b1c12e 100644
--- a/src/metrics/average_batch_r2/script.py
+++ b/src/metrics/average_batch_r2/script.py
@@ -84,8 +84,8 @@
     uns={
         "dataset_id": integrated_s1.uns["dataset_id"],
         "method_id": integrated_s1.uns["method_id"],
-        "metric_ids": "average_batch_r2_ct",
-        "metric_values": average_batch_r2_ct,
+        "metric_ids": ["average_batch_r2_ct"],
+        "metric_values": [average_batch_r2_ct],
         "r2_collection_ct": r2_collection_ct,
     }
 )
diff --git a/src/metrics/flowsom_mapping_similarity/script.R b/src/metrics/flowsom_mapping_similarity/script.R
index fa1a268a..2e246b83 100644
--- a/src/metrics/flowsom_mapping_similarity/script.R
+++ b/src/metrics/flowsom_mapping_similarity/script.R
@@ -144,8 +144,8 @@ output <- anndata::AnnData(
   uns = list(
     dataset_id = integrated_s1$uns$dataset_id,
     method_id = integrated_s1$uns$method_id,
-    metric_ids = "flowsom_mean_mapping_similarity",
-    metric_values = fs_mapping_similarity_avg,
+    metric_ids = list("flowsom_mean_mapping_similarity"),
+    metric_values = list(fs_mapping_similarity_avg),
     fsom_absdiff_by_donor_refsplit = fsom_absdiff_by_donor_refsplit,
     fsom_parameters = list(
       "xdim" = grid_xdim,