diff --git a/common/block.go b/common/block.go
index 8da2d55..21c270a 100644
--- a/common/block.go
+++ b/common/block.go
@@ -94,7 +94,7 @@ type posBuf struct {
 
 func decode29(data []byte, colors *Colors) (*DecodedBlock, error) {
 
-	dec, err := zstd.NewReader(bytes.NewReader(data))
+	dec, err := zstd.NewReader(bytes.NewReader(data[1:]))
 	if err != nil {
 		return nil, err
 	}