diff --git a/src/plugins/haskell/haskellplugin.cpp b/src/plugins/haskell/haskellplugin.cpp
index 6da003c1a50..632b9514a98 100644
--- a/src/plugins/haskell/haskellplugin.cpp
+++ b/src/plugins/haskell/haskellplugin.cpp
@@ -17,8 +17,6 @@
 #include <extensionsystem/iplugin.h>
 
 #include <projectexplorer/jsonwizard/jsonwizardfactory.h>
-#include <projectexplorer/projectmanager.h>
-#include <projectexplorer/runcontrol.h>
 
 #include <texteditor/snippets/snippetprovider.h>
 
@@ -51,8 +49,8 @@ public:
 
         setupHaskellEditor();
 
-        ProjectExplorer::ProjectManager::registerProjectType<HaskellProject>(
-            Constants::C_HASKELL_PROJECT_MIMETYPE);
+        setupHaskellProject();
+
         TextEditor::SnippetProvider::registerGroup(Constants::C_HASKELLSNIPPETSGROUP_ID,
                                                    Tr::tr("Haskell", "SnippetProvider"));
 
diff --git a/src/plugins/haskell/haskellproject.cpp b/src/plugins/haskell/haskellproject.cpp
index f19840a67f5..01d652c49ef 100644
--- a/src/plugins/haskell/haskellproject.cpp
+++ b/src/plugins/haskell/haskellproject.cpp
@@ -5,14 +5,16 @@
 
 #include "haskellconstants.h"
 
-#include <coreplugin/iversioncontrol.h>
-#include <coreplugin/vcsmanager.h>
-
+#include <projectexplorer/buildsystem.h>
 #include <projectexplorer/buildtargetinfo.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/projectmanager.h>
+#include <projectexplorer/projectnodes.h>
 #include <projectexplorer/target.h>
+#include <projectexplorer/treescanner.h>
 
 #include <utils/algorithm.h>
-#include <utils/fileutils.h>
+#include <utils/filepath.h>
 #include <utils/qtcassert.h>
 
 #include <QFile>
@@ -21,8 +23,7 @@
 using namespace ProjectExplorer;
 using namespace Utils;
 
-namespace Haskell {
-namespace Internal {
+namespace Haskell::Internal {
 
 static QVector<QString> parseExecutableNames(const FilePath &projectFilePath)
 {
@@ -42,18 +43,23 @@ static QVector<QString> parseExecutableNames(const FilePath &projectFilePath)
     return result;
 }
 
-HaskellProject::HaskellProject(const Utils::FilePath &fileName)
-    : Project(Constants::C_HASKELL_PROJECT_MIMETYPE, fileName)
+class HaskellBuildSystem final : public BuildSystem
 {
-    setId(Constants::C_HASKELL_PROJECT_ID);
-    setDisplayName(fileName.toFileInfo().completeBaseName());
-    setBuildSystemCreator([](Target *t) { return new HaskellBuildSystem(t); });
-}
+public:
+    HaskellBuildSystem(Target *t);
 
-bool HaskellProject::isHaskellProject(Project *project)
-{
-    return project && project->id() == Constants::C_HASKELL_PROJECT_ID;
-}
+    void triggerParsing() final;
+
+    QString name() const final { return QLatin1String("haskell"); }
+
+private:
+    void updateApplicationTargets();
+    void refresh();
+
+private:
+    ParseGuard m_parseGuard;
+    TreeScanner m_scanner;
+};
 
 HaskellBuildSystem::HaskellBuildSystem(Target *t)
     : BuildSystem(t)
@@ -108,5 +114,22 @@ void HaskellBuildSystem::updateApplicationTargets()
     target()->updateDefaultRunConfigurations();
 }
 
-} // namespace Internal
-} // namespace Haskell
+class HaskellProject final : public Project
+{
+public:
+    explicit HaskellProject(const FilePath &fileName)
+        : Project(Constants::C_HASKELL_PROJECT_MIMETYPE, fileName)
+    {
+        setId(Constants::C_HASKELL_PROJECT_ID);
+        setDisplayName(fileName.toFileInfo().completeBaseName());
+        setBuildSystemCreator([](Target *t) { return new HaskellBuildSystem(t); });
+    }
+};
+
+void setupHaskellProject()
+{
+    ProjectManager::registerProjectType<HaskellProject>(
+        Constants::C_HASKELL_PROJECT_MIMETYPE);
+}
+
+} // Haskell::Internal
diff --git a/src/plugins/haskell/haskellproject.h b/src/plugins/haskell/haskellproject.h
index 79bec049ae4..79627d9c5b0 100644
--- a/src/plugins/haskell/haskellproject.h
+++ b/src/plugins/haskell/haskellproject.h
@@ -3,42 +3,8 @@
 
 #pragma once
 
-#include <projectexplorer/buildsystem.h>
-#include <projectexplorer/project.h>
-#include <projectexplorer/projectnodes.h>
-#include <projectexplorer/treescanner.h>
+namespace Haskell::Internal {
 
-namespace Haskell {
-namespace Internal {
+void setupHaskellProject();
 
-class HaskellProject : public ProjectExplorer::Project
-{
-    Q_OBJECT
-
-public:
-    explicit HaskellProject(const Utils::FilePath &fileName);
-
-    static bool isHaskellProject(Project *project);
-};
-
-class HaskellBuildSystem : public ProjectExplorer::BuildSystem
-{
-    Q_OBJECT
-
-public:
-    HaskellBuildSystem(ProjectExplorer::Target *t);
-
-    void triggerParsing() override;
-    QString name() const final { return QLatin1String("haskell"); }
-
-private:
-    void updateApplicationTargets();
-    void refresh();
-
-private:
-    ParseGuard m_parseGuard;
-    ProjectExplorer::TreeScanner m_scanner;
-};
-
-} // namespace Internal
-} // namespace Haskell
+} // Haskell::Internal