diff --git a/src/ol/source/Raster.js b/src/ol/source/Raster.js
index b2fd1f6ff0..3d36395da2 100644
--- a/src/ol/source/Raster.js
+++ b/src/ol/source/Raster.js
@@ -789,13 +789,6 @@ class RasterSource extends ImageSource {
     );
   }
 
-  /**
-   * @return {null} not implemented
-   */
-  getImageInternal() {
-    return null; // not implemented
-  }
-
   disposeInternal() {
     if (this.processor_) {
       this.processor_.dispose();