diff --git a/src/ol/format/filter/Bbox.js b/src/ol/format/filter/Bbox.js
index 04455a28df..736abadcfc 100644
--- a/src/ol/format/filter/Bbox.js
+++ b/src/ol/format/filter/Bbox.js
@@ -31,6 +31,9 @@ class Bbox extends Filter {
      * @type {import("../../extent.js").Extent}
      */
     this.extent = extent;
+    if (extent.length !== 4) {
+      throw new Error('Expected an extent with four values ([minX, minY, maxX, maxY])');
+    }
 
     /**
      * @type {string|undefined}