diff --git a/src/ol/format/WKB.js b/src/ol/format/WKB.js
index 37c0a5f1c5..e04649a6d9 100644
--- a/src/ol/format/WKB.js
+++ b/src/ol/format/WKB.js
@@ -817,7 +817,7 @@ class WKB extends FeatureFormat {
     );
     const buffer = writer.getBuffer();
 
-    return this.hex !== false ? encodeHexString(buffer) : buffer;
+    return this.hex ? encodeHexString(buffer) : buffer;
   }
 }