src/java.base/share/classes/java/time/chrono/ChronoPeriodImpl.java

@@ -107,10 +107,11 @@
     private static final List<TemporalUnit> SUPPORTED_UNITS = List.of(YEARS, MONTHS, DAYS);
 
     /**
      * The chronology.
      */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private final Chronology chrono;
     /**
      * The number of years.
      */
     final int years;