1 files changed, 3 insertions, 1 deletions
diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/IndexData.java b/src/main/java/com/healthmarketscience/jackcess/impl/IndexData.java
index 1c430fc..c08e70b 100644
--- a/src/main/java/com/healthmarketscience/jackcess/impl/IndexData.java
+++ b/src/main/java/com/healthmarketscience/jackcess/impl/IndexData.java
@@ -685,7 +685,9 @@ public class IndexData {
   {
     if(newEntry != null) {
       dataPage.addEntry(idx, newEntry);
-      if(!isDupeEntry) {
+      // if we are adding a duplicate entry, or replacing an existing entry,
+      // then the unique entry count doesn't change
+      if(!isDupeEntry && (oldEntry == null)) {
         ++_uniqueEntryCount;
       }
       ++_modCount;