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

*** 107,116 ****
--- 107,117 ----
      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;