diff --git a/src/core/jpx_stream.js b/src/core/jpx_stream.js
index ded33062b..f38c2bb58 100644
--- a/src/core/jpx_stream.js
+++ b/src/core/jpx_stream.js
@@ -22,13 +22,12 @@ import { shadow } from "../shared/util.js";
  * the stream behaves like all the other DecodeStreams.
  */
 class JpxStream extends DecodeStream {
-  constructor(stream, maybeLength, params) {
+  constructor(stream, maybeLength) {
     super(maybeLength);
 
     this.stream = stream;
     this.dict = stream.dict;
     this.maybeLength = maybeLength;
-    this.params = params;
   }
 
   get bytes() {
diff --git a/src/core/parser.js b/src/core/parser.js
index b608f5612..78c660088 100644
--- a/src/core/parser.js
+++ b/src/core/parser.js
@@ -808,7 +808,7 @@ class Parser {
           return new JpegStream(stream, maybeLength, params);
         case "JPX":
         case "JPXDecode":
-          return new JpxStream(stream, maybeLength, params);
+          return new JpxStream(stream, maybeLength);
         case "A85":
         case "ASCII85Decode":
           return new Ascii85Stream(stream, maybeLength);