diff --git a/src/ol/format/GMLBase.js b/src/ol/format/GMLBase.js
index 926bf8b076..de39b64953 100644
--- a/src/ol/format/GMLBase.js
+++ b/src/ol/format/GMLBase.js
@@ -255,33 +255,28 @@ class GMLBase extends XMLFeature {
   /**
    * @param {Element} node Node.
    * @param {Array<*>} objectStack Object stack.
-   * @return {import("../geom/Geometry.js").default|import("../extent.js").Extent|undefined} Geometry.
+   * @return {import("../extent.js").Extent|undefined} Geometry.
    */
   readExtentElement(node, objectStack) {
     const context = /** @type {Object} */ (objectStack[0]);
-    const extent = this.readGeometryOrExtent(node, objectStack);
-    return extent
-      ? transformExtentWithOptions(
-          /** @type {import("../extent.js").Extent} */ (extent),
-          context
-        )
-      : undefined;
+    const extent = /** @type {import("../extent.js").Extent} */ (
+      this.readGeometryOrExtent(node, objectStack)
+    );
+    return extent ? transformExtentWithOptions(extent, context) : undefined;
   }
 
   /**
    * @param {Element} node Node.
    * @param {Array<*>} objectStack Object stack.
-   * @return {import("../geom/Geometry.js").default|import("../extent.js").Extent|undefined} Geometry.
+   * @return {import("../geom/Geometry.js").default|undefined} Geometry.
    */
   readGeometryElement(node, objectStack) {
     const context = /** @type {Object} */ (objectStack[0]);
-    const geometry = this.readGeometryOrExtent(node, objectStack);
+    const geometry = /** @type {import("../geom/Geometry.js").default} */ (
+      this.readGeometryOrExtent(node, objectStack)
+    );
     return geometry
-      ? transformGeometryWithOptions(
-          /** @type {import("../geom/Geometry.js").default} */ (geometry),
-          false,
-          context
-        )
+      ? transformGeometryWithOptions(geometry, false, context)
       : undefined;
   }
 
@@ -556,9 +551,8 @@ class GMLBase extends XMLFeature {
    * @param {Element} node Node.
    * @param {import("./Feature.js").ReadOptions} [opt_options] Options.
    * @protected
-   * @return {import("../geom/Geometry.js").default|import("../extent.js").Extent} Geometry.
+   * @return {import("../geom/Geometry.js").default} Geometry.
    */
-  //@ts-ignore
   readGeometryFromNode(node, opt_options) {
     const geometry = this.readGeometryElement(node, [
       this.getReadOptions(node, opt_options ? opt_options : {}),