diff --git a/src/Propel/Generator/Behavior/Archivable/ArchivableBehavior.php b/src/Propel/Generator/Behavior/Archivable/ArchivableBehavior.php
index 01d99067fe..b25bfd6853 100644
--- a/src/Propel/Generator/Behavior/Archivable/ArchivableBehavior.php
+++ b/src/Propel/Generator/Behavior/Archivable/ArchivableBehavior.php
@@ -134,7 +134,7 @@ protected function addArchiveTable(): void
             // see https://github.com/propelorm/Propel/issues/175 for details
             foreach ($table->getUnices() as $unique) {
                 $index = new Index();
-                $index->setTable($table);
+                $index->setTable($archiveTable);
                 foreach ($unique->getColumns() as $columnName) {
                     if ($size = $unique->getColumnSize($columnName)) {
                         $index->addColumn(['name' => $columnName, 'size' => $size]);
@@ -142,7 +142,10 @@ protected function addArchiveTable(): void
                         $index->addColumn(['name' => $columnName]);
                     }
                 }
-                $archiveTable->addIndex($index);
+
+                if (!$archiveTable->hasIndex($index->getName())) {
+                    $archiveTable->addIndex($index);
+                }
             }
             // every behavior adding a table should re-execute database behaviors
             foreach ($database->getBehaviors() as $behavior) {
diff --git a/tests/Propel/Tests/Generator/Behavior/Archivable/ArchivableBehaviorTest.php b/tests/Propel/Tests/Generator/Behavior/Archivable/ArchivableBehaviorTest.php
index 1cd677a924..44bb6cad70 100644
--- a/tests/Propel/Tests/Generator/Behavior/Archivable/ArchivableBehaviorTest.php
+++ b/tests/Propel/Tests/Generator/Behavior/Archivable/ArchivableBehaviorTest.php
@@ -27,6 +27,7 @@
 use Map\MyOldArchivableTest3TableMap;
 use Propel\Generator\Util\QuickBuilder;
 use Propel\Tests\TestCase;
+use function substr_count;
 
 /**
  * Tests for ArchivableBehavior class
@@ -83,6 +84,9 @@ public function setUp(): void
         <unique>
             <unique-column name="title"/>
         </unique>
+        <index>
+            <index-column name="title"/>
+        </index>
         <behavior name="archivable">
             <parameter name="log_archived_at" value="false"/>
             <parameter name="archive_table" value="my_old_archivable_test_3"/>
@@ -208,6 +212,15 @@ public function testCopiesUniquesToIndices()
         $this->assertStringContainsString($expected, self::$generatedSQL);
     }
 
+    /**
+     * @return void
+     */
+    public function testCopiedUniqueDoesNotDuplicateCopiedIndex()
+    {
+        $expectedSqlMigration = 'CREATE INDEX my_old_archivable_test_3_i_639136 ON my_old_archivable_test_3 (title);';
+        $this->assertSame(1, substr_count(self::$generatedSQL, $expectedSqlMigration));
+    }
+
     /**
      * @return void
      */