diff --git a/engines/buried/environ/ai_lab.cpp b/engines/buried/environ/ai_lab.cpp
index 63ed1e35b6e..dc27949316a 100644
--- a/engines/buried/environ/ai_lab.cpp
+++ b/engines/buried/environ/ai_lab.cpp
@@ -299,8 +299,8 @@ class UseCheeseGirlPropellant : public BaseOxygenTimer {
 public:
 	UseCheeseGirlPropellant(BuriedEngine *vm, Window *viewWindow, const LocationStaticData &sceneStaticData, const Location &priorLocation);
 	int postEnterRoom(Window *viewWindow, const Location &priorLocation) override;
-	int draggingItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags);
-	int droppedItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags);
+	int draggingItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags) override;
+	int droppedItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags) override;
 
 private:
 	Common::Rect _badPos;
@@ -746,11 +746,11 @@ class IceteroidDispenserControls : public BaseOxygenTimer {
 public:
 	IceteroidDispenserControls(BuriedEngine *vm, Window *viewWindow, const LocationStaticData &sceneStaticData, const Location &priorLocation);
 	int preExitRoom(Window *viewWindow, const Location &priorLocation) override;
-	int mouseDown(Window *viewWindow, const Common::Point &pointLocation);
-	int mouseUp(Window *viewWindow, const Common::Point &pointLocation);
-	int specifyCursor(Window *viewWindow, const Common::Point &pointLocation);
-	int draggingItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags);
-	int droppedItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags);
+	int mouseDown(Window *viewWindow, const Common::Point &pointLocation) override;
+	int mouseUp(Window *viewWindow, const Common::Point &pointLocation) override;
+	int specifyCursor(Window *viewWindow, const Common::Point &pointLocation) override;
+	int draggingItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags) override;
+	int droppedItem(Window *viewWindow, int itemID, const Common::Point &pointLocation, int itemFlags) override;
 
 private:
 	Common::Rect _oxygenHandle;
@@ -1306,8 +1306,8 @@ class NexusDoor : public BaseOxygenTimer {
 public:
 	NexusDoor(BuriedEngine *vm, Window *viewWindow, const LocationStaticData &sceneStaticData, const Location &priorLocation);
 	int postEnterRoom(Window *viewWindow, const Location &priorLocation) override;
-	int mouseUp(Window *viewWindow, const Common::Point &pointLocation);
-	int specifyCursor(Window *viewWindow, const Common::Point &pointLocation);
+	int mouseUp(Window *viewWindow, const Common::Point &pointLocation) override;
+	int specifyCursor(Window *viewWindow, const Common::Point &pointLocation) override;
 
 private:
 	//uint32 _entryStartTime;