diff --git a/imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/HuffmanTable.java b/imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/HuffmanTable.java
index 8181cc48..add7c5b8 100644
--- a/imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/HuffmanTable.java
+++ b/imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/HuffmanTable.java
@@ -145,8 +145,8 @@ final class HuffmanTable extends Segment {
             }
 
             int c = temp >> 4;
-            if (c > 2) {
-                throw new IIOException("Unexpected JPEG Huffman Table class (> 2): " + c);
+            if (c > 1) {
+                throw new IIOException("Unexpected JPEG Huffman Table class (> 1): " + c);
             }
 
             table.tc[t][c] = true;