diff --git a/icu4j/src/com/ibm/icu/text/UnicodeSet.java b/icu4j/src/com/ibm/icu/text/UnicodeSet.java
index 984d0d466e8..020e8b07a67 100755
--- a/icu4j/src/com/ibm/icu/text/UnicodeSet.java
+++ b/icu4j/src/com/ibm/icu/text/UnicodeSet.java
@@ -2374,7 +2374,7 @@ public class UnicodeSet extends UnicodeFilter {
     public void addAll(Collection source) {
         Iterator it = source.iterator();
         while (it.hasNext()) {
-            source.add(it.next().toString());
+            add(it.next().toString());
         }
     }