diff --git a/pdf.js b/pdf.js
index a7de0bb35..f61250a0c 100644
--- a/pdf.js
+++ b/pdf.js
@@ -2458,13 +2458,7 @@ var CanvasGraphics = (function() {
                     var tokens = [];
                     var token = "";
 
-                    var length = cmapObj.length;
-                    if (cmapObj instanceof FlateStream) {
-                      cmapObj.readBlock();
-                      length = cmapObj.bufferLength;
-                    }
-
-                    var cmap = cmapObj.getBytes(length);
+                    var cmap = cmapObj.getBytes(cmapObj.length);
                     for (var i =0; i < cmap.length; i++) {
                       var byte = cmap[i];
                       if (byte == 0x20 || byte == 0x0A || byte == 0x3C || byte == 0x3E) {