diff --git a/src/lib/deskflow/App.cpp b/src/lib/deskflow/App.cpp
index da0dfecc9..f0eb1be6f 100644
--- a/src/lib/deskflow/App.cpp
+++ b/src/lib/deskflow/App.cpp
@@ -168,7 +168,7 @@ void App::handleScreenError() const
   getEvents()->addEvent(Event(EventTypes::Quit));
 }
 
-void App::quit()
+void App::quit() const
 {
   LOG_INFO("quitting");
   getEvents()->addEvent(Event(EventTypes::Quit));
diff --git a/src/lib/deskflow/App.h b/src/lib/deskflow/App.h
index 2700ca5dc..e3b351a79 100644
--- a/src/lib/deskflow/App.h
+++ b/src/lib/deskflow/App.h
@@ -46,7 +46,7 @@ public:
     }
   };
 
-  App(IEventQueue *events, const QString &processName);
+  explicit App(IEventQueue *events, const QString &processName);
   App(App const &) = delete;
   App(App &&) = delete;
   ~App() override;
@@ -77,7 +77,7 @@ public:
   }
 
   void run(QThread &coreThread);
-  void quit();
+  void quit() const;
   void setupFileLogging();
   void loggingFilterWarning() const;
   void initApp() override;
@@ -125,7 +125,7 @@ protected:
   struct LoopErrorCode
   {
     int m_errorCode;
-    LoopErrorCode(int errorCode) : m_errorCode(errorCode)
+    explicit LoopErrorCode(int errorCode) : m_errorCode(errorCode)
     {
     }
   };