diff --git a/src/core/astnode.h b/src/core/astnode.h
index 635fbdbe..a13d3b34 100644
--- a/src/core/astnode.h
+++ b/src/core/astnode.h
@@ -18,8 +18,6 @@ namespace treesitter {
 class Node;
 }
 
-class TestCodeDocument;
-
 namespace Core {
 
 class CodeDocument;
diff --git a/src/core/codedocument.h b/src/core/codedocument.h
index 72195ef9..f5ba534c 100644
--- a/src/core/codedocument.h
+++ b/src/core/codedocument.h
@@ -33,7 +33,6 @@ class Query;
 
 namespace Core {
 
-class LspCache;
 class TreeSitterHelper;
 struct RegexpTransform;
 class AstNode;
diff --git a/src/core/knutcore.h b/src/core/knutcore.h
index 22fbbad1..aad7eef6 100644
--- a/src/core/knutcore.h
+++ b/src/core/knutcore.h
@@ -15,8 +15,6 @@
 #include <QCommandLineParser>
 #include <QObject>
 
-class QCoreApplication;
-
 namespace Core {
 
 class KnutCore : public QObject
diff --git a/src/core/scriptdialogitem.h b/src/core/scriptdialogitem.h
index df67622b..71bf872c 100644
--- a/src/core/scriptdialogitem.h
+++ b/src/core/scriptdialogitem.h
@@ -21,7 +21,6 @@ class ScriptProgressDialog;
 class QTextDocument;
 
 namespace KSyntaxHighlighting {
-class SyntaxHighlighter;
 }
 
 namespace Core {
diff --git a/src/gui/qmlview.h b/src/gui/qmlview.h
index 084f060d..3f4cb74c 100644
--- a/src/gui/qmlview.h
+++ b/src/gui/qmlview.h
@@ -12,10 +12,6 @@
 
 #include "textview.h"
 
-namespace Core {
-class QmlDocument;
-}
-
 namespace Gui {
 
 class QmlView : public TextView
diff --git a/src/gui/scriptlistpanel.h b/src/gui/scriptlistpanel.h
index 52a2fc1a..6ea1c8eb 100644
--- a/src/gui/scriptlistpanel.h
+++ b/src/gui/scriptlistpanel.h
@@ -12,16 +12,11 @@
 
 #include <QTreeView>
 
-namespace Core {
-class Document;
-}
 class QToolButton;
 class QLineEdit;
 
 namespace Gui {
 
-class IView;
-
 class ScriptListPanel : public QTreeView
 {
 
diff --git a/src/gui/slintview.h b/src/gui/slintview.h
index 182c8f57..6153b464 100644
--- a/src/gui/slintview.h
+++ b/src/gui/slintview.h
@@ -12,10 +12,6 @@
 
 #include "textview.h"
 
-namespace Core {
-class SlintDocument;
-}
-
 class QProcess;
 
 namespace Gui {
diff --git a/src/gui/textview.h b/src/gui/textview.h
index 63f6c67e..4c2bad33 100644
--- a/src/gui/textview.h
+++ b/src/gui/textview.h
@@ -14,7 +14,6 @@
 
 #include <QWidget>
 
-class QRubberBand;
 class QToolButton;
 
 namespace Core {