diff --git a/src/main/java/com/fasterxml/jackson/dataformat/xml/ser/XmlSerializerProvider.java b/src/main/java/com/fasterxml/jackson/dataformat/xml/ser/XmlSerializerProvider.java
index 6ef95c32a..36b766208 100644
--- a/src/main/java/com/fasterxml/jackson/dataformat/xml/ser/XmlSerializerProvider.java
+++ b/src/main/java/com/fasterxml/jackson/dataformat/xml/ser/XmlSerializerProvider.java
@@ -96,7 +96,7 @@ public void serializeValue(JsonGenerator gen, Object value) throws IOException
                 rootName = _rootNameLookup.findRootName(cls, _config);
             }
             _initWithRootName(xgen, rootName);
-            asArray = TypeUtil.isIndexedType(cls);
+            asArray = TypeUtil.isIndexedType(_config.constructType(cls));
             if (asArray) {
                 _startRootArray(xgen, rootName);
             }
@@ -155,7 +155,7 @@ public void serializeValue(JsonGenerator gen, Object value, JavaType rootType,
             }
             _initWithRootName(xgen, rootName);
             asArray = (rootType == null)
-                    ? TypeUtil.isIndexedType(value.getClass())
+                    ? TypeUtil.isIndexedType(_config.constructType(value.getClass()))
                         : TypeUtil.isIndexedType(rootType);
             if (asArray) {
                 _startRootArray(xgen, rootName);
@@ -204,7 +204,7 @@ public void serializePolymorphic(JsonGenerator gen, Object value, JavaType rootT
             }
             _initWithRootName(xgen, rootName);
             asArray = (rootType == null)
-                    ? TypeUtil.isIndexedType(value.getClass())
+                    ? TypeUtil.isIndexedType(_config.constructType(value.getClass()))
                     : TypeUtil.isIndexedType(rootType);
             if (asArray) {
                 _startRootArray(xgen, rootName);
diff --git a/src/main/java/com/fasterxml/jackson/dataformat/xml/util/TypeUtil.java b/src/main/java/com/fasterxml/jackson/dataformat/xml/util/TypeUtil.java
index 8ad7e51b0..9328a35a2 100644
--- a/src/main/java/com/fasterxml/jackson/dataformat/xml/util/TypeUtil.java
+++ b/src/main/java/com/fasterxml/jackson/dataformat/xml/util/TypeUtil.java
@@ -15,7 +15,7 @@ public class TypeUtil
     public static boolean isIndexedType(JavaType type)
     {
         Class<?> cls = type.getRawClass();
-        if (type.isContainerType() || canHandleLikeAnIterable(cls)) {
+        if (type.isContainerType() || type.isIterationType()) {
             // One special case; byte[] will be serialized as base64-encoded String, not real array, so:
             // (actually, ditto for char[]; thought to be a String)
             if (cls == byte[].class || cls == char[].class) {
@@ -30,20 +30,4 @@ public static boolean isIndexedType(JavaType type)
         }
         return false;
     }    
-
-    public static boolean isIndexedType(Class<?> cls)
-    {
-        return  (cls.isArray() && cls != byte[].class && cls != char[].class)
-            || Collection.class.isAssignableFrom(cls) || canHandleLikeAnIterable(cls);
-    }
-
-    /**
-     * See <a href="https://github.com/FasterXML/jackson-dataformat-xml/pull/597">related disccussions</a> 
-     * for detailed history.
-     * 
-     * @since 2.16
-     */
-    private static boolean canHandleLikeAnIterable(Class<?> cls) {
-        return Iterator.class.isAssignableFrom(cls) || Stream.class.isAssignableFrom(cls);
-    }
 }