diff --git a/src/parser.js b/src/parser.js
index 1c50d0f5f..2855018a6 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -249,9 +249,12 @@ var Parser = (function ParserClosure() {
       if (name == 'CCITTFaxDecode' || name == 'CCF') {
         return new CCITTFaxStream(stream, params);
       }
-      if (name == 'RunLengthDecode') {
+      if (name == 'RunLengthDecode' || name == 'RL') {
         return new RunLengthStream(stream);
       }
+      if (name == 'JBIG2Decode') {
+        error('JBIG2 image format is not currently supprted.');
+      }
       warn('filter "' + name + '" not supported yet');
       return stream;
     }