diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3873711b2e..de2e5d8c93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,6 +144,9 @@ endif (DISABLE_TTF)
 ADD_CHECK_C_COMPILER_FLAG(CMAKE_C_FLAGS C_WARN_WRITE_STRINGS -Wno-error=date-time)
 ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_WRITE_STRINGS -Wno-error=date-time)
 ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_NULL_DEREFERENCE -Wnull-dereference)
+ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_SUGGEST_FINAL_TYPES -Wsuggest-final-types)
+ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_SUGGEST_FINAL_METHODS -Wsuggest-final-methods)
+ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_SUGGEST_OVERRIDE -Wsuggest-override)
 
 if (FORCE32)
     set(TARGET_M "-m32")
diff --git a/src/openrct2/drawing/engines/SoftwareDrawingEngine.cpp b/src/openrct2/drawing/engines/SoftwareDrawingEngine.cpp
index 8e72bc32c1..4a016c0801 100644
--- a/src/openrct2/drawing/engines/SoftwareDrawingEngine.cpp
+++ b/src/openrct2/drawing/engines/SoftwareDrawingEngine.cpp
@@ -81,7 +81,7 @@ public:
         _screenDPI = dpi;
     }
 
-    void Draw(sint32 x, sint32 y, sint32 width, sint32 height, sint32 xStart, sint32 yStart)
+    void Draw(sint32 x, sint32 y, sint32 width, sint32 height, sint32 xStart, sint32 yStart) override
     {
         static const uint8 RainPattern[] =
         {
diff --git a/src/openrct2/rct1/S4Importer.cpp b/src/openrct2/rct1/S4Importer.cpp
index d51217a342..bb9dcf63ff 100644
--- a/src/openrct2/rct1/S4Importer.cpp
+++ b/src/openrct2/rct1/S4Importer.cpp
@@ -118,7 +118,7 @@ private:
     uint8 _researchRideTypeUsed[128];
 
 public:
-    void LoadSavedGame(const utf8 * path)
+    void LoadSavedGame(const utf8 * path) override
     {
         if (!rct1_read_sv4(path, &_s4))
         {
@@ -127,7 +127,7 @@ public:
         _s4Path = path;
     }
 
-    void LoadScenario(const utf8 * path)
+    void LoadScenario(const utf8 * path) override
     {
         if (!rct1_read_sc4(path, &_s4))
         {
@@ -136,7 +136,7 @@ public:
         _s4Path = path;
     }
 
-    void Import()
+    void Import() override
     {
         Initialise();