diff --git a/indexer/validate_and_format_contacts.cpp b/indexer/validate_and_format_contacts.cpp
index f5bd200930..8fde4311f6 100644
--- a/indexer/validate_and_format_contacts.cpp
+++ b/indexer/validate_and_format_contacts.cpp
@@ -332,4 +332,4 @@ bool ValidateLinePage(string const & page)
   return (domain == "line.me" || strings::EndsWith(domain, ".line.me"));
 }
 
-} // namespace osm
\ No newline at end of file
+} // namespace osm
diff --git a/map/power_management/power_manager.hpp b/map/power_management/power_manager.hpp
index 44a6a93c3d..da0f61b25b 100644
--- a/map/power_management/power_manager.hpp
+++ b/map/power_management/power_manager.hpp
@@ -19,10 +19,10 @@ public:
   class Subscriber
   {
   public:
+    virtual void OnPowerFacilityChanged(Facility const facility, bool enabled) = 0;
+    virtual void OnPowerSchemeChanged(Scheme const actualScheme) = 0;
+  protected:
     virtual ~Subscriber() = default;
-
-    virtual void OnPowerFacilityChanged(Facility const facility, bool enabled) {}
-    virtual void OnPowerSchemeChanged(Scheme const actualScheme) {}
   };
 
   static std::string GetConfigPath();
diff --git a/platform/battery_tracker.hpp b/platform/battery_tracker.hpp
index 320b8372f1..b2691d035a 100644
--- a/platform/battery_tracker.hpp
+++ b/platform/battery_tracker.hpp
@@ -14,6 +14,8 @@ public:
   {
   public:
     virtual void OnBatteryLevelReceived(uint8_t level) = 0;
+  protected:
+    virtual ~Subscriber() = default;
   };
 
   void Subscribe(Subscriber * subscriber);
diff --git a/platform/http_thread_callback.hpp b/platform/http_thread_callback.hpp
index e642cc5678..d188ef189c 100644
--- a/platform/http_thread_callback.hpp
+++ b/platform/http_thread_callback.hpp
@@ -9,5 +9,8 @@ class IHttpThreadCallback
 public:
   virtual bool OnWrite(int64_t offset, void const * buffer, size_t size) = 0;
   virtual void OnFinish(long httpOrErrorCode, int64_t begRange, int64_t endRange) = 0;
+
+protected:
+  virtual ~IHttpThreadCallback() = default;
 };
 } // namespace downloader
diff --git a/platform/location_service.hpp b/platform/location_service.hpp
index 99b125743b..c4057fe421 100644
--- a/platform/location_service.hpp
+++ b/platform/location_service.hpp
@@ -10,6 +10,8 @@ class LocationObserver
 public:
   virtual void OnLocationError(TLocationError errorCode) = 0;
   virtual void OnLocationUpdated(GpsInfo const & info) = 0;
+protected:
+  virtual ~LocationObserver() = default;
 };
 
 class LocationService
@@ -19,7 +21,7 @@ protected:
 
 public:
   LocationService(LocationObserver & observer) : m_observer(observer) {}
-  virtual ~LocationService() {}
+  virtual ~LocationService() = default;
 
   virtual void Start() = 0;
   virtual void Stop() = 0;
diff --git a/routing/road_graph.hpp b/routing/road_graph.hpp
index 5acba3f8bf..4d71a4ca92 100644
--- a/routing/road_graph.hpp
+++ b/routing/road_graph.hpp
@@ -147,6 +147,9 @@ public:
 
   virtual void GetRouteEdges(EdgeVector & routeEdges) const;
   virtual void GetRouteSegments(std::vector<Segment> & segments) const;
+
+protected:
+  virtual ~RoadGraphBase() = default;
 };
 
 class IRoadGraph : public RoadGraphBase
@@ -274,8 +277,6 @@ public:
                    bool bidirectional) override;
   };
 
-  virtual ~IRoadGraph() = default;
-
   void GetOutgoingEdges(geometry::PointWithAltitude const & junction,
                         EdgeListT & edges) const override;
 
diff --git a/storage/downloader_queue_interface.hpp b/storage/downloader_queue_interface.hpp
index 9b0aa6147d..d5201eff4b 100644
--- a/storage/downloader_queue_interface.hpp
+++ b/storage/downloader_queue_interface.hpp
@@ -14,5 +14,8 @@ public:
   virtual size_t Count() const = 0;
   virtual bool Contains(CountryId const & country) const = 0;
   virtual void ForEachCountry(ForEachCountryFunction const & fn) const = 0;
+
+protected:
+  virtual ~QueueInterface() = default;
 };
 }  // namespace storage
diff --git a/storage/queued_country.hpp b/storage/queued_country.hpp
index 15142f9841..d9ece15d1b 100644
--- a/storage/queued_country.hpp
+++ b/storage/queued_country.hpp
@@ -22,6 +22,8 @@ public:
     virtual void OnStartDownloading(QueuedCountry const & queuedCountry) = 0;
     virtual void OnDownloadProgress(QueuedCountry const & queuedCountry, downloader::Progress const & progress) = 0;
     virtual void OnDownloadFinished(QueuedCountry const & queuedCountry, downloader::DownloadStatus status) = 0;
+  protected:
+    virtual ~Subscriber() = default;
   };
 
   QueuedCountry(platform::CountryFile const & countryFile, CountryId const & m_countryId,