diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPUnknownMember.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPUnknownMember.java
index cb47bdc96ab..e3a166bc803 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPUnknownMember.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPUnknownMember.java
@@ -30,7 +30,7 @@ import org.eclipse.core.runtime.CoreException;
  * Represents a binding that is unknown because it depends on template arguments.
  */
 public class CPPUnknownMember extends CPPUnknownBinding	implements ICPPUnknownMember, ISerializableType {
-    protected IType fOwner;
+    protected final IType fOwner;
 
     protected CPPUnknownMember(IType owner, char[] name) {
         super(name);
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPUnknownMemberClass.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPUnknownMemberClass.java
index e1527ac55dd..dcbe0d4d89f 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPUnknownMemberClass.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPUnknownMemberClass.java
@@ -65,12 +65,14 @@ public class PDOMCPPUnknownMemberClass extends CPPUnknownMemberClass implements
 	public long getBindingID() {
 		return 0;
 	}
-	
+
 	@Override
 	public IIndexFragmentBinding getOwner() {
-		return (IIndexFragmentBinding) super.getOwner();
+		if (fOwner instanceof IIndexFragmentBinding)
+			return (IIndexFragmentBinding) fOwner;
+		return null;
 	}
-	
+
 	@Override
 	public IIndexScope getScope() {
 		try {