diff --git a/src/main/java/com/mapconductor/here/HereMapViewController.kt b/src/main/java/com/mapconductor/here/HereMapViewController.kt
index 8150c0d..fa2e323 100644
--- a/src/main/java/com/mapconductor/here/HereMapViewController.kt
+++ b/src/main/java/com/mapconductor/here/HereMapViewController.kt
@@ -88,6 +88,8 @@ class HereMapViewController(
         groundImageController.clear()
         circleController.clear()
         rasterLayerController.clear()
+        // 拡張モジュール（クラスタリングなど）が登録した Strategy のマーカーも消す。
+        clearStrategyMarkerControllers()
     }
 
     override fun setMarkerAnimationOverlayHost(host: MarkerAnimationOverlayHost?) {