diff --git a/paimon-arrow/src/main/java/org/apache/paimon/arrow/writer/ArrowFieldWriterFactoryVisitor.java b/paimon-arrow/src/main/java/org/apache/paimon/arrow/writer/ArrowFieldWriterFactoryVisitor.java
index 9c1a55ec33ea..eef53009cec3 100644
--- a/paimon-arrow/src/main/java/org/apache/paimon/arrow/writer/ArrowFieldWriterFactoryVisitor.java
+++ b/paimon-arrow/src/main/java/org/apache/paimon/arrow/writer/ArrowFieldWriterFactoryVisitor.java
@@ -158,6 +158,7 @@ public ArrowFieldWriterFactory visit(MapType mapType) {
         ArrowFieldWriterFactory valueWriterFactory = mapType.getValueType().accept(this);
         return fieldVector -> {
             MapVector mapVector = (MapVector) fieldVector;
+            mapVector.reAlloc();
             List<FieldVector> keyValueVectors = mapVector.getDataVector().getChildrenFromFields();
             return new ArrowFieldWriters.MapWriter(
                     fieldVector,