diff --git a/app/CalypAppModuleIf.cpp b/app/CalypAppModuleIf.cpp
index d7c1f1c..0d5d6ac 100644
--- a/app/CalypAppModuleIf.cpp
+++ b/app/CalypAppModuleIf.cpp
@@ -97,7 +97,7 @@ void CalypAppModuleIf::update( bool isPlaying )
 //   }
 // }
 
-bool CalypAppModuleIf::isRunning()
+bool CalypAppModuleIf::isRunning() const
 {
 #ifdef CALYP_THREADED_MODULES
   return QThread::isRunning();
diff --git a/app/CalypAppModuleIf.h b/app/CalypAppModuleIf.h
index 8c6203d..3f58b37 100644
--- a/app/CalypAppModuleIf.h
+++ b/app/CalypAppModuleIf.h
@@ -81,16 +81,16 @@ public:
   CalypAppModuleIf( QObject* parent, QAction* action, CalypModulePtr&& module );
   ~CalypAppModuleIf();
 
-  auto getSubWindowList() -> const std::vector<VideoSubWindow*>& { return m_pcSubWindow; }
+  auto getSubWindowList() const -> const std::vector<VideoSubWindow*>& { return m_pcSubWindow; }
 
   CalypModuleIf* getModule() { return m_pcModule.get(); }
-  unsigned int getModuleRequirements() { return m_pcModule->m_uiModuleRequirements; }
-  std::string moduleInfo() { return m_pcModule->moduleInfo(); }
+  auto getModuleRequirements() const -> ClpModuleFeatures { return m_pcModule->m_uiModuleRequirements; }
+  std::string moduleInfo() const { return m_pcModule->moduleInfo(); }
   void update( bool isPlaying );
   bool apply( bool isPlaying = false, bool disableThreads = false );
   bool process();
   // void setPlaying( bool isPlaying );
-  bool isRunning();
+  bool isRunning() const;
   void show();
   void disable();