diff --git a/src/ol/render/Feature.js b/src/ol/render/Feature.js
index 62ed6f08f38..838009dac44 100644
--- a/src/ol/render/Feature.js
+++ b/src/ol/render/Feature.js
@@ -282,10 +282,12 @@ class RenderFeature {
 
   /**
    * Get the feature properties.
-   * @return {Object<string, *>} Feature properties.
+   * @template {Object<string, *>} T = An optional generic type of the requested feature properties
+   * @return {T} Feature properties.
    * @api
    */
   getProperties() {
+    // @ts-ignore (= this.properties_ as T)
     return this.properties_;
   }