diff --git a/examples/encoders/simpleType/anyType-with-xsi-info.php b/examples/encoders/simpleType/anyType-with-xsi-info.php
index 2ca3522..d875f75 100644
--- a/examples/encoders/simpleType/anyType-with-xsi-info.php
+++ b/examples/encoders/simpleType/anyType-with-xsi-info.php
@@ -6,7 +6,6 @@
 use Soap\Encoding\Encoder\SimpleType\ScalarTypeEncoder;
 use Soap\Encoding\Encoder\XmlEncoder;
 use Soap\Encoding\EncoderRegistry;
-use Soap\Engine\Metadata\Model\TypeMeta;
 use Soap\WsdlReader\Model\Definitions\BindingUse;
 use VeeWee\Reflecta\Iso\Iso;
 
@@ -41,17 +40,10 @@ public function iso(Context $context): Iso
             /**
              * This method allows to change the context on the wrapping elementEncoder.
              * By forcing the bindingUse to `ENCODED`, we can make sure the xsi:type attribute is added.
-             * We also make sure the type is not qualified so that the xsi:type prefix xmlns is imported as well.
              */
             public function enhanceElementContext(Context $context): Context
             {
-                return $context
-                    ->withBindingUse(BindingUse::ENCODED)
-                    ->withType(
-                        $context->type->withMeta(
-                            static fn (TypeMeta $meta): TypeMeta => $meta->withIsQualified(false)
-                        )
-                    );
+                return $context->withBindingUse(BindingUse::ENCODED);
             }
         }
     );
diff --git a/src/Xml/Writer/ElementValueBuilder.php b/src/Xml/Writer/ElementValueBuilder.php
index 723d6bb..669f908 100644
--- a/src/Xml/Writer/ElementValueBuilder.php
+++ b/src/Xml/Writer/ElementValueBuilder.php
@@ -47,10 +47,14 @@ private function buildXsiType(XMLWriter $writer): Generator
             return;
         }
 
+        $context = $this->context;
+        $type = $context->type;
+
         yield from (new XsiAttributeBuilder(
             $this->context,
-            XsiTypeDetector::detectFromValue($this->context, $this->value),
-            includeXsiTargetNamespace:  !$this->context->type->getMeta()->isQualified()->unwrapOr(false)
+            XsiTypeDetector::detectFromValue($context, $this->value),
+            includeXsiTargetNamespace: $type->getXmlTargetNamespace() !== $type->getXmlNamespace()
+                || !$type->getMeta()->isQualified()->unwrapOr(false)
         ))($writer);
     }