diff --git a/icu4j/src/com/ibm/icu/dev/test/perf/ConverterPerformanceTest.java b/icu4j/src/com/ibm/icu/dev/test/perf/ConverterPerformanceTest.java
index a41b6c4563a..3e61bdabdb5 100644
--- a/icu4j/src/com/ibm/icu/dev/test/perf/ConverterPerformanceTest.java
+++ b/icu4j/src/com/ibm/icu/dev/test/perf/ConverterPerformanceTest.java
@@ -18,6 +18,8 @@ import java.nio.charset.CharsetDecoder;
 import java.nio.charset.CharsetEncoder;
 import java.nio.charset.CodingErrorAction;
 
+import sun.io.CharToByteConverter;
+
 import com.ibm.icu.charset.CharsetProviderICU;
 
 /**
@@ -44,10 +46,25 @@ public class ConverterPerformanceTest extends PerfTest {
             encoder.onUnmappableCharacter(CodingErrorAction.REPORT);
             ByteBuffer target = encoder.encode(source);
             
+            CharToByteConverter conv = CharToByteConverter.getConverter("UTF-8");
+            conv.setSubstitutionMode(false);
+            byte[] encBuffer2 = conv.convertAll(unicodeBuffer);
+            
+            boolean b = true;
             // target.array() will probably return what we want, but lets take no chances
             encBuffer = new byte[target.limit()];
-            for (int i=0; i<encBuffer.length; i++)
+            for (int i=0; i<encBuffer.length; i++) {
                 encBuffer[i] = target.get(i);
+                if (encBuffer[i] != encBuffer2[i]) {
+                    System.out.println("difference: " + Integer.toHexString(0xff & encBuffer[i]) + " " + Integer.toHexString(0xff & encBuffer2[i]));
+                    b = false;
+                }
+            }
+            System.out.println(b);
+            System.out.println(encBuffer.length);
+            System.out.println(encBuffer2.length);
+            
+            
             
             // we created some heavy objects, so lets try to clean up a little
             gc();