diff --git a/src/main/java/com/eternitywall/ots/attestation/UnknownAttestation.java b/src/main/java/com/eternitywall/ots/attestation/UnknownAttestation.java
index 5bfb019..ce3132e 100644
--- a/src/main/java/com/eternitywall/ots/attestation/UnknownAttestation.java
+++ b/src/main/java/com/eternitywall/ots/attestation/UnknownAttestation.java
@@ -19,7 +19,7 @@ public class UnknownAttestation extends TimeAttestation {
 
     byte[] payload;
 
-    public static byte[] _TAG = new byte[]{};
+    public byte[] _TAG = new byte[]{};
 
     @Override
     public byte[] _TAG() {