diff --git a/src/plugins/genericprojectmanager/genericmakestep.cpp b/src/plugins/genericprojectmanager/genericmakestep.cpp
index e66a938ab3f..f987ac65865 100644
--- a/src/plugins/genericprojectmanager/genericmakestep.cpp
+++ b/src/plugins/genericprojectmanager/genericmakestep.cpp
@@ -34,6 +34,12 @@ using namespace ProjectExplorer;
 namespace GenericProjectManager {
 namespace Internal {
 
+class GenericMakeStep : public ProjectExplorer::MakeStep
+{
+public:
+    explicit GenericMakeStep(BuildStepList *parent, Core::Id id);
+};
+
 GenericMakeStep::GenericMakeStep(BuildStepList *parent, Core::Id id)
     : MakeStep(parent, id)
 {
diff --git a/src/plugins/genericprojectmanager/genericmakestep.h b/src/plugins/genericprojectmanager/genericmakestep.h
index 5e83216f490..85d312646dd 100644
--- a/src/plugins/genericprojectmanager/genericmakestep.h
+++ b/src/plugins/genericprojectmanager/genericmakestep.h
@@ -27,20 +27,10 @@
 
 #include <projectexplorer/makestep.h>
 
-QT_FORWARD_DECLARE_CLASS(QListWidgetItem);
-
 namespace GenericProjectManager {
 namespace Internal {
 
-class GenericMakeStep : public ProjectExplorer::MakeStep
-{
-    Q_OBJECT
-
-public:
-    explicit GenericMakeStep(ProjectExplorer::BuildStepList *parent, Core::Id id);
-};
-
-class GenericMakeStepFactory : public ProjectExplorer::BuildStepFactory
+class GenericMakeStepFactory final : public ProjectExplorer::BuildStepFactory
 {
 public:
     GenericMakeStepFactory();