diff --git a/src/konqbookmarkmenu_p.h b/src/konqbookmarkmenu_p.h
index c828f7ba99b06fd94dba83722efae6cea544a9de..aeaa096769f4bf35b849b274bcaa8c538e26861d 100644
--- a/src/konqbookmarkmenu_p.h
+++ b/src/konqbookmarkmenu_p.h
@@ -28,7 +28,6 @@
 class QString;
 class QMenu;
 class KBookmark;
-class KBookmarkGroup;
 class KBookmarkOwner;
 
 namespace Konqueror { // to avoid clashes with KF5::Bookmarks classes
diff --git a/webenginepart/src/about/konq_aboutpage.h b/webenginepart/src/about/konq_aboutpage.h
index 1802ea5d74c0af9bc2c6ce7bf9aa64605313a4ac..ae2eced4f8f0ad40432c1cb3e0ba2c6ddc6936cb 100644
--- a/webenginepart/src/about/konq_aboutpage.h
+++ b/webenginepart/src/about/konq_aboutpage.h
@@ -3,7 +3,6 @@
 
 #include <QWebEngineUrlSchemeHandler>
 
-class QUrl;
 
 class KonqAboutPageSingleton
 {
diff --git a/webenginepart/src/webenginecustomizecacheablefieldsdlg.h b/webenginepart/src/webenginecustomizecacheablefieldsdlg.h
index 7e7f9e518634b1b8aa5fbdbf04cb30848c986054..275aae210f9e2e122f133205e6fca14890d94726 100644
--- a/webenginepart/src/webenginecustomizecacheablefieldsdlg.h
+++ b/webenginepart/src/webenginecustomizecacheablefieldsdlg.h
@@ -27,7 +27,6 @@
 
 #include "webenginewallet.h"
 
-class WebFieldsDataViewPasswordDelegate;
 class WebFieldsDataModel;
 
 namespace Ui {
diff --git a/webenginepart/src/webenginepage.h b/webenginepart/src/webenginepage.h
index 2ec352be1367060789b95d8a3255662fc01c5faa..f4f7ab83367affd97dcab759d3477b5cfcb7bf0e 100644
--- a/webenginepart/src/webenginepage.h
+++ b/webenginepart/src/webenginepage.h
@@ -38,7 +38,6 @@ class QAuthenticator;
 class QUrl;
 class WebSslInfo;
 class WebEnginePart;
-class QWebEngineDownloadItem;
 class KPasswdServerClient;
 class WebEngineWallet;
 class QWebEngineFullScreenRequest;
diff --git a/webenginepart/src/webenginepart.h b/webenginepart/src/webenginepart.h
index 19d106c172bfc3cbf7135650fe3fa3166871655b..fbd5036e8626ae135e680353cef9981db8a9f1cb 100644
--- a/webenginepart/src/webenginepart.h
+++ b/webenginepart/src/webenginepart.h
@@ -43,7 +43,6 @@ class FeaturePermissionBar;
 class KUrlLabel;
 class WebEngineBrowserExtension;
 class WebEngineWallet;
-class WebEngineErrorSchemeHandler;
 
 /**
  * A KPart wrapper for the QtWebEngine's browser rendering engine.
diff --git a/webenginepart/src/webenginepartdownloadmanager.h b/webenginepart/src/webenginepartdownloadmanager.h
index f77373a27f620859af616cb63bea5ae12fd6cdd2..f726f4f5e6b9dc08ca74c954ed34b94c78980510 100644
--- a/webenginepart/src/webenginepartdownloadmanager.h
+++ b/webenginepart/src/webenginepartdownloadmanager.h
@@ -30,7 +30,6 @@
 #include <KJob>
 
 class WebEnginePage;
-class QFile;
 
 class WebEnginePartDownloadManager : public QObject
 {