diff --git a/src/main/java/de/bluecolored/bluemap/api/markers/HtmlMarker.java b/src/main/java/de/bluecolored/bluemap/api/markers/HtmlMarker.java
index 8b6a806..8e4c0e3 100644
--- a/src/main/java/de/bluecolored/bluemap/api/markers/HtmlMarker.java
+++ b/src/main/java/de/bluecolored/bluemap/api/markers/HtmlMarker.java
@@ -232,6 +232,7 @@ public HtmlMarker build() {
                     checkNotNull(html, "html")
             );
             if (anchor != null) marker.setAnchor(anchor);
+            marker.setStyleClasses(classes);
             return build(marker);
         }
 
diff --git a/src/main/java/de/bluecolored/bluemap/api/markers/POIMarker.java b/src/main/java/de/bluecolored/bluemap/api/markers/POIMarker.java
index a35c84e..4e7311b 100644
--- a/src/main/java/de/bluecolored/bluemap/api/markers/POIMarker.java
+++ b/src/main/java/de/bluecolored/bluemap/api/markers/POIMarker.java
@@ -271,6 +271,7 @@ public POIMarker build() {
             if (detail != null) marker.setDetail(detail);
             if (icon != null) marker.setIcon(icon, anchor);
             else if (anchor != null) marker.setAnchor(anchor);
+            marker.setStyleClasses(classes);
             return build(marker);
         }