diff --git a/source/org/thdl/tib/text/TibetanDocument.java b/source/org/thdl/tib/text/TibetanDocument.java
index c59b0f1..184a65b 100644
--- a/source/org/thdl/tib/text/TibetanDocument.java
+++ b/source/org/thdl/tib/text/TibetanDocument.java
@@ -735,6 +735,7 @@ public class TibetanDocument extends DefaultStyledDocument {
                         if (replaceInsteadOfInserting()) {
                             if (toUnicode) {
                                 replaceDuffWithUnicode(fontSize, i, unicode);
+                                i += unicode.length() - 1; // we do i++ below
                             } else {
                                 replaceDuff(fontSize, i, equivalent[0], !toTM);
                             }