diff --git a/src/plugins/nim/project/nimcompilercleanstep.cpp b/src/plugins/nim/project/nimcompilercleanstep.cpp
index d0e264da161..3fce967a34a 100644
--- a/src/plugins/nim/project/nimcompilercleanstep.cpp
+++ b/src/plugins/nim/project/nimcompilercleanstep.cpp
@@ -40,6 +40,24 @@ using namespace Utils;
 
 namespace Nim {
 
+class NimCompilerCleanStep final : public BuildStep
+{
+    Q_DECLARE_TR_FUNCTIONS(Nim::NimCompilerCleanStep)
+
+public:
+    NimCompilerCleanStep(BuildStepList *parentList, Core::Id id);
+
+private:
+    bool init() final;
+    void doRun() final;
+    void doCancel() final {}  // Can be left empty. The run() function hardly does anything.
+
+    bool removeCacheDirectory();
+    bool removeOutFilePath();
+
+    Utils::FilePath m_buildDir;
+};
+
 NimCompilerCleanStep::NimCompilerCleanStep(BuildStepList *parentList, Core::Id id)
     : BuildStep(parentList, id)
 {
@@ -68,32 +86,27 @@ bool NimCompilerCleanStep::init()
 void NimCompilerCleanStep::doRun()
 {
     if (!m_buildDir.exists()) {
-        emit addOutput(tr("Build directory \"%1\" does not exist.").arg(m_buildDir.toUserOutput()), BuildStep::OutputFormat::ErrorMessage);
+        emit addOutput(tr("Build directory \"%1\" does not exist.").arg(m_buildDir.toUserOutput()), OutputFormat::ErrorMessage);
         emit finished(false);
         return;
     }
 
     if (!removeCacheDirectory()) {
-        emit addOutput(tr("Failed to delete the cache directory."), BuildStep::OutputFormat::ErrorMessage);
+        emit addOutput(tr("Failed to delete the cache directory."), OutputFormat::ErrorMessage);
         emit finished(false);
         return;
     }
 
     if (!removeOutFilePath()) {
-        emit addOutput(tr("Failed to delete the out file."), BuildStep::OutputFormat::ErrorMessage);
+        emit addOutput(tr("Failed to delete the out file."), OutputFormat::ErrorMessage);
         emit finished(false);
         return;
     }
 
-    emit addOutput(tr("Clean step completed successfully."), BuildStep::OutputFormat::NormalMessage);
+    emit addOutput(tr("Clean step completed successfully."), OutputFormat::NormalMessage);
     emit finished(true);
 }
 
-void NimCompilerCleanStep::doCancel()
-{
-    // Can be left empty. The run() function hardly does anything.
-}
-
 bool NimCompilerCleanStep::removeCacheDirectory()
 {
     auto bc = qobject_cast<NimBuildConfiguration*>(buildConfiguration());
diff --git a/src/plugins/nim/project/nimcompilercleanstep.h b/src/plugins/nim/project/nimcompilercleanstep.h
index 483d627b9eb..4086cf72751 100644
--- a/src/plugins/nim/project/nimcompilercleanstep.h
+++ b/src/plugins/nim/project/nimcompilercleanstep.h
@@ -26,30 +26,10 @@
 #pragma once
 
 #include <projectexplorer/buildstep.h>
-#include <projectexplorer/buildsteplist.h>
-#include <utils/fileutils.h>
 
 namespace Nim {
 
-class NimCompilerCleanStep : public ProjectExplorer::BuildStep
-{
-    Q_OBJECT
-
-public:
-    NimCompilerCleanStep(ProjectExplorer::BuildStepList *parentList, Core::Id id);
-
-private:
-    bool init() override;
-    void doRun() override;
-    void doCancel() override;
-
-    bool removeCacheDirectory();
-    bool removeOutFilePath();
-
-    Utils::FilePath m_buildDir;
-};
-
-class NimCompilerCleanStepFactory : public ProjectExplorer::BuildStepFactory
+class NimCompilerCleanStepFactory final : public ProjectExplorer::BuildStepFactory
 {
 public:
     NimCompilerCleanStepFactory();