diff --git a/xml/impl/src/com/intellij/html/impl/RelaxedHtmlFromSchemaElementDescriptor.java b/xml/impl/src/com/intellij/html/impl/RelaxedHtmlFromSchemaElementDescriptor.java
index 13201f8f993a..52a1920a1d9b 100644
--- a/xml/impl/src/com/intellij/html/impl/RelaxedHtmlFromSchemaElementDescriptor.java
+++ b/xml/impl/src/com/intellij/html/impl/RelaxedHtmlFromSchemaElementDescriptor.java
@@ -74,7 +74,7 @@ public class RelaxedHtmlFromSchemaElementDescriptor extends XmlElementDescriptor
       return descriptors;
     }
     for (XmlAttributeDescriptorsProvider provider: Extensions.getExtensions(XmlAttributeDescriptorsProvider.EP_NAME)) {
-      descriptors = ArrayUtil.mergeArrays(descriptors, provider.getAttributeDescriptors(context));
+      descriptors = ArrayUtil.mergeArrays(descriptors, provider.getAttributeDescriptors(context), XmlAttributeDescriptor.ARRAY_FACTORY);
     }
     return descriptors;
   }
diff --git a/xml/openapi/src/com/intellij/xml/XmlAttributeDescriptor.java b/xml/openapi/src/com/intellij/xml/XmlAttributeDescriptor.java
index 545028c0d8aa..e279ed71c684 100644
--- a/xml/openapi/src/com/intellij/xml/XmlAttributeDescriptor.java
+++ b/xml/openapi/src/com/intellij/xml/XmlAttributeDescriptor.java
@@ -18,6 +18,7 @@ package com.intellij.xml;
 
 import com.intellij.psi.meta.PsiMetaData;
 import com.intellij.psi.xml.XmlElement;
+import com.intellij.util.ArrayFactory;
 import org.jetbrains.annotations.Nullable;
 
 /**
@@ -25,6 +26,12 @@ import org.jetbrains.annotations.Nullable;
  */
 public interface XmlAttributeDescriptor extends PsiMetaData {
   XmlAttributeDescriptor[] EMPTY = new XmlAttributeDescriptor[0];
+  ArrayFactory<XmlAttributeDescriptor> ARRAY_FACTORY = new ArrayFactory<XmlAttributeDescriptor>() {
+    @Override
+    public XmlAttributeDescriptor[] create(int count) {
+      return new XmlAttributeDescriptor[count];
+    }
+  };
 
   boolean isRequired();
   boolean isFixed();