diff --git a/src/ol/format/filter/Bbox.js b/src/ol/format/filter/Bbox.js
index f95f81d0e5..736abadcfc 100644
--- a/src/ol/format/filter/Bbox.js
+++ b/src/ol/format/filter/Bbox.js
@@ -30,7 +30,7 @@ class Bbox extends Filter {
     /**
      * @type {import("../../extent.js").Extent}
      */
-      this.extent = extent;
+    this.extent = extent;
     if (extent.length !== 4) {
       throw new Error('Expected an extent with four values ([minX, minY, maxX, maxY])');
     }