diff --git a/xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.java b/xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.java
index 89b2eaefd408..afaa453d1bbd 100644
--- a/xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.java
+++ b/xml/dom-impl/src/com/intellij/util/xml/impl/PhysicalDomParentStrategy.java
@@ -82,7 +82,9 @@ public class PhysicalDomParentStrategy implements DomParentStrategy {
     final XmlElement thatElement = ((PhysicalDomParentStrategy)o).myElement;
     if (xmlElementsEqual(myElement, thatElement)) {
       if (myElement != thatElement) {
-        assert myElement.getNavigationElement() == thatElement.getNavigationElement();
+        final PsiElement nav1 = myElement.getNavigationElement();
+        final PsiElement nav2 = thatElement.getNavigationElement();
+        assert nav1 == nav2 : nav1 + "!=" + nav2;
       }
       return true;
     }