diff --git a/installer/data/mysql/atomicupdate/bug_18639_add_replacementprice_field_to_aqorders.perl b/installer/data/mysql/atomicupdate/bug_18639_add_replacementprice_field_to_aqorders.perl
index 004d6ab29b..152b14d0e7 100644
--- a/installer/data/mysql/atomicupdate/bug_18639_add_replacementprice_field_to_aqorders.perl
+++ b/installer/data/mysql/atomicupdate/bug_18639_add_replacementprice_field_to_aqorders.perl
@@ -1,6 +1,9 @@
 $DBversion = 'XXX';  # will be replaced by the RM
 if( CheckVersion( $DBversion ) ) {
-    $dbh->do( "ALTER TABLE  aqorders ADD COLUMN replacementprice DECIMAL(28,6)" );
+    if( !column_exists( 'aqorders', 'replacementprice' ){
+        $dbh->do( "ALTER TABLE  aqorders ADD COLUMN replacementprice DECIMAL(28,6)" );
+        $dbh->do( "UPDATE aqorders set replacementprice = rrp WHERE replacementprice IS NULL" );
+    }
     SetVersion( $DBversion );
     print "Upgrade to $DBversion done (Bug 18639 - Add replacementprice field to aqorders table)\n";
 }