diff --git a/language/duchain/navigation/abstractdeclarationnavigationcontext.cpp b/language/duchain/navigation/abstractdeclarationnavigationcontext.cpp
--- a/language/duchain/navigation/abstractdeclarationnavigationcontext.cpp
+++ b/language/duchain/navigation/abstractdeclarationnavigationcontext.cpp
@@ -403,7 +403,7 @@
       Declaration* classDecl = m_declaration->context()->owner();
       if(classDecl) {
         uint maxAllowedSteps = m_fullBackwardSearch ? (uint)-1 : 10;
-        QList<Declaration*> overriders = DUChainUtils::getOverriders(classDecl, classFunDecl, maxAllowedSteps);
+        QList<Declaration*> overriders = QList<Declaration*>::fromSet(DUChainUtils::getOverriders(classDecl, classFunDecl, maxAllowedSteps).toSet());
         
         if(!overriders.isEmpty()) {
           modifyHtml() += i18n("Overridden in ");
@@ -426,7 +426,7 @@
   
   ///Show all classes that inherit this one
   uint maxAllowedSteps = m_fullBackwardSearch ? (uint)-1 : 10;
-  QList<Declaration*> inheriters = DUChainUtils::getInheriters(m_declaration.data(), maxAllowedSteps);
+  QList<Declaration*> inheriters = QList<Declaration*>::fromSet(DUChainUtils::getInheriters(m_declaration.data(), maxAllowedSteps).toSet());
   
   if(!inheriters.isEmpty()) {
       modifyHtml() += i18n("Inherited by ");
diff --git a/language/duchain/navigation/usescollector.cpp b/language/duchain/navigation/usescollector.cpp
--- a/language/duchain/navigation/usescollector.cpp
+++ b/language/duchain/navigation/usescollector.cpp
@@ -152,6 +152,8 @@
 
         decls << decl;
 
+        decls = QList<Declaration*>::fromSet(decls.toSet());
+
         ///Collect all "parsed versions" or forward-declarations etc. here, into allDeclarations
         QSet<IndexedDeclaration> allDeclarations;
 
diff --git a/plugins/classbrowser/classmodelnode.cpp b/plugins/classbrowser/classmodelnode.cpp
--- a/plugins/classbrowser/classmodelnode.cpp
+++ b/plugins/classbrowser/classmodelnode.cpp
@@ -424,7 +424,7 @@
   if ( klass )
   {
     uint steps = 10000;
-    QList< Declaration* > inheriters = DUChainUtils::getInheriters(klass, steps, true);
+    QList<Declaration*> inheriters = QList<Declaration*>::fromSet(DUChainUtils::getInheriters(klass, steps, true).toSet());
 
     foreach( Declaration* decl, inheriters )
     {