diff --git a/src/plugins/clangrefactoring/refactoringengine.cpp b/src/plugins/clangrefactoring/refactoringengine.cpp
index 6b5546cc88c..1b6c81538d0 100644
--- a/src/plugins/clangrefactoring/refactoringengine.cpp
+++ b/src/plugins/clangrefactoring/refactoringengine.cpp
@@ -56,6 +56,7 @@ RefactoringEngine::RefactoringEngine(ClangBackEnd::RefactoringServerInterface &s
       m_filePathCache(filePathCache),
       m_symbolQuery(symbolQuery)
 {
+    Q_UNUSED(m_client)
 }
 
 RefactoringEngine::~RefactoringEngine() = default;
diff --git a/src/tools/clangpchmanagerbackend/source/pchtaskqueue.h b/src/tools/clangpchmanagerbackend/source/pchtaskqueue.h
index 80d96b8e852..f7be8ae012e 100644
--- a/src/tools/clangpchmanagerbackend/source/pchtaskqueue.h
+++ b/src/tools/clangpchmanagerbackend/source/pchtaskqueue.h
@@ -55,7 +55,9 @@ public:
         , m_transactionsInterface(transactionsInterface)
         , m_progressCounter(progressCounter)
         , m_environment(environment)
-    {}
+    {
+        Q_UNUSED(m_transactionsInterface)
+    }
 
     void addSystemPchTasks(PchTasks &&pchTasks) override;
     void addProjectPchTasks(PchTasks &&pchTasks) override;
diff --git a/src/tools/clangpchmanagerbackend/source/projectpartsmanager.h b/src/tools/clangpchmanagerbackend/source/projectpartsmanager.h
index 426aa0229f9..8e7de474298 100644
--- a/src/tools/clangpchmanagerbackend/source/projectpartsmanager.h
+++ b/src/tools/clangpchmanagerbackend/source/projectpartsmanager.h
@@ -57,7 +57,9 @@ public:
         , m_filePathCache(filePathCache)
         , m_clangPathwatcher(clangPathwatcher)
         , m_generatedFiles(generatedFiles)
-    {}
+    {
+        Q_UNUSED(m_filePathCache)
+    }
 
     UpToDataProjectParts update(ProjectPartContainers &&projectsParts) override;
     void remove(const ProjectPartIds &projectPartIds) override;