diff --git a/plugin/trino-delta-lake/src/main/java/io/trino/plugin/deltalake/transactionlog/checkpoint/CheckpointWriter.java b/plugin/trino-delta-lake/src/main/java/io/trino/plugin/deltalake/transactionlog/checkpoint/CheckpointWriter.java
index 2548462128f4..74c3eaa22fdf 100644
--- a/plugin/trino-delta-lake/src/main/java/io/trino/plugin/deltalake/transactionlog/checkpoint/CheckpointWriter.java
+++ b/plugin/trino-delta-lake/src/main/java/io/trino/plugin/deltalake/transactionlog/checkpoint/CheckpointWriter.java
@@ -457,7 +457,7 @@ private void writeStringMap(BlockBuilder blockBuilder, RowType type, int fieldId
                 mapBuilder.appendNull();
             }
             else {
-                mapType.getKeyType().writeSlice(mapBuilder, utf8Slice(entry.getValue()));
+                mapType.getValueType().writeSlice(mapBuilder, utf8Slice(entry.getValue()));
             }
         }
         blockBuilder.closeEntry();