diff -r 705c3f88a409 -r 6e017b301287 src/java.base/share/classes/java/security/GuardedObject.java
--- a/src/java.base/share/classes/java/security/GuardedObject.java	Wed Oct 09 17:38:58 2019 +0100
+++ b/src/java.base/share/classes/java/security/GuardedObject.java	Wed Oct 09 09:57:41 2019 -0700
@@ -52,7 +52,9 @@
     @java.io.Serial
     private static final long serialVersionUID = -5240450096227834308L;
 
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Object object; // the object we are guarding
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Guard guard;   // the guard
 
     /**