diff --git a/src/akonadi-contacts/collectionfiltermodel.cpp b/src/akonadi-contacts/collectionfiltermodel.cpp
--- a/src/akonadi-contacts/collectionfiltermodel.cpp
+++ b/src/akonadi-contacts/collectionfiltermodel.cpp
@@ -52,7 +52,11 @@
     }
 
     if (!mContentMimeTypes.isEmpty()) {
+#if (QT_VERSION < QT_VERSION_CHECK(5, 14, 0))
         QSet<QString> contentMimeTypes = collection.contentMimeTypes().toSet();
+#else
+        QSet<QString> contentMimeTypes(collection.contentMimeTypes().cbegin(), collection.contentMimeTypes().cend());
+#endif
         accepted = accepted && contentMimeTypes.intersects(mContentMimeTypes);
     }