diff --git a/src/main/java/ua/net/uid/utils/security/keccak/KeccakProvider.java b/src/main/java/ua/net/uid/utils/security/keccak/KeccakProvider.java
index 46669bc..7cedeb5 100644
--- a/src/main/java/ua/net/uid/utils/security/keccak/KeccakProvider.java
+++ b/src/main/java/ua/net/uid/utils/security/keccak/KeccakProvider.java
@@ -6,6 +6,7 @@
 // https://github.com/aelstad/keccakj
 
 public class KeccakProvider extends Provider {
+    private static final long serialVersionUID = -8921705755661710566L;
 
     KeccakProvider() {
         super("ua.net.uid.utils.security.keccak", 1.0, "Keccak-*/SHA3-* digest");