diff --git a/bindings/node/lib/bindings/encoding.d.ts b/bindings/node/lib/bindings/encoding.d.ts
index cffc557e..da02f00b 100644
--- a/bindings/node/lib/bindings/encoding.d.ts
+++ b/bindings/node/lib/bindings/encoding.d.ts
@@ -25,7 +25,7 @@ export interface Encoding {
   /**
    * Returns the special tokens mask
    */
-  getSpecialTokensMask(): number;
+  getSpecialTokensMask(): number[];
 
   /**
    * Returns the tokenized string