diff --git a/src/core/cache.h b/src/core/cache.h
--- a/src/core/cache.h
+++ b/src/core/cache.h
@@ -76,7 +76,7 @@
     QString m_kns2ComponentName;
 
     QSet<EntryInternal> cache;
-    QHash<QString, EntryInternal::List> requestCache;
+    QHash<QString, QSet<EntryInternal>> requestCache;
 };
 
 }
diff --git a/src/core/cache.cpp b/src/core/cache.cpp
--- a/src/core/cache.cpp
+++ b/src/core/cache.cpp
@@ -246,13 +246,13 @@
 void Cache::insertRequest(const KNSCore::Provider::SearchRequest &request, const KNSCore::EntryInternal::List &entries)
 {
     // append new entries
-    requestCache[request.hashForRequest()].append(entries);
+    requestCache[request.hashForRequest()].unite(QSet<EntryInternal>::fromList(entries));
     qCDebug(KNEWSTUFFCORE) << request.hashForRequest() << " add: " << entries.size() << " keys: " << requestCache.keys();
 }
 
 EntryInternal::List Cache::requestFromCache(const KNSCore::Provider::SearchRequest &request)
 {
     qCDebug(KNEWSTUFFCORE) << request.hashForRequest();
-    return requestCache.value(request.hashForRequest());
+    return requestCache.value(request.hashForRequest()).toList();
 }