diff --git a/common/src/main/java/org/conscrypt/OpenSslSlhDsaPrivateKey.java b/common/src/main/java/org/conscrypt/OpenSslSlhDsaPrivateKey.java
index 42bccd3fd..5a8d759a8 100644
--- a/common/src/main/java/org/conscrypt/OpenSslSlhDsaPrivateKey.java
+++ b/common/src/main/java/org/conscrypt/OpenSslSlhDsaPrivateKey.java
@@ -26,6 +26,8 @@
 
 /** A SLH-DSA private key. */
 public class OpenSslSlhDsaPrivateKey implements PrivateKey {
+    private static final long serialVersionUID = 0x87e8776a4491fecbL;
+
     static final int PRIVATE_KEY_SIZE_BYTES = 64;
 
     private byte[] raw;
diff --git a/common/src/main/java/org/conscrypt/OpenSslSlhDsaPublicKey.java b/common/src/main/java/org/conscrypt/OpenSslSlhDsaPublicKey.java
index 43facb260..fb9f75d6c 100644
--- a/common/src/main/java/org/conscrypt/OpenSslSlhDsaPublicKey.java
+++ b/common/src/main/java/org/conscrypt/OpenSslSlhDsaPublicKey.java
@@ -26,6 +26,8 @@
 
 /** An SLH-DSA public key. */
 public class OpenSslSlhDsaPublicKey implements PublicKey {
+    private static final long serialVersionUID = 0x4589aa00e279d127L;
+
     static final int PUBLIC_KEY_SIZE_BYTES = 32;
 
     private final byte[] raw;