diff --git a/src/java.base/share/classes/sun/util/calendar/ZoneInfoFile.java b/src/java.base/share/classes/sun/util/calendar/ZoneInfoFile.java
index d6349f2cf2444..8bfb8088108ce 100644
--- a/src/java.base/share/classes/sun/util/calendar/ZoneInfoFile.java
+++ b/src/java.base/share/classes/sun/util/calendar/ZoneInfoFile.java
@@ -289,9 +289,7 @@ private static void load(DataInputStream dis) throws IOException {
             }
         }
         // old us time-zone names
-        for (var key : ZoneId.SHORT_IDS.keySet()) {
-            aliases.put(key, ZoneId.SHORT_IDS.get(key));
-        }
+        aliases.putAll(ZoneId.SHORT_IDS);
     }
 
     /////////////////////////Ser/////////////////////////////////