diff --git a/src/org/apache/xml/serializer/ToStream.java b/src/org/apache/xml/serializer/ToStream.java
index 1134eb7ee..e55e6c2d5 100644
--- a/src/org/apache/xml/serializer/ToStream.java
+++ b/src/org/apache/xml/serializer/ToStream.java
@@ -1594,6 +1594,11 @@ else if (ch == CharInfo.S_LINE_SEPARATOR) {
                         writer.write("
");
                         lastDirtyCharProcessed = i;
                     }
+                    if (Character.isHighSurrogate(ch))
+                    {
+                        lastDirtyCharProcessed = processDirty(chars,end, i,ch, lastDirtyCharProcessed, true);
+                        i = lastDirtyCharProcessed;
+                    }
                     else if (m_encodingInfo.isInEncoding(ch)) {
                         // If the character is in the encoding, and
                         // not in the normal ASCII range, we also