diff --git a/C4/Search.pm b/C4/Search.pm
index 8b19d1ffe4..0c4f7baa44 100644
--- a/C4/Search.pm
+++ b/C4/Search.pm
@@ -93,6 +93,7 @@ sub FindDuplicate {
     if ( $result->{isbn} ) {
         $result->{isbn} =~ s/\(.*$//;
         $result->{isbn} =~ s/\s+$//;
+        $result->{isbn} =~ s/\|/OR/;
         $query = "isbn:$result->{isbn}";
     }
     else {
diff --git a/t/db_dependent/Search.t b/t/db_dependent/Search.t
index a01ccfe3e2..6424ed4eac 100755
--- a/t/db_dependent/Search.t
+++ b/t/db_dependent/Search.t
@@ -291,6 +291,15 @@ sub run_marc21_search_tests {
     ($biblionumber,undef,$title) = FindDuplicate($record);
     is($biblionumber, 51, 'Found duplicate with ISBN');
 
+    $record = MARC::Record->new;
+    $record->add_fields(
+            [ '020', ' ', ' ', a => '0465039146' ],
+            [ '020', ' ', ' ', a => '9780465039142' ],
+            [ '245', '0', '0', a => 'Doesnt matter, searching isbn /' ]
+            );
+    ($biblionumber,undef,$title) = FindDuplicate($record);
+    is($biblionumber, 48, 'Found duplicate with ISBN when two ISBNs in record');
+
     $record = MARC::Record->new;
 
     $record->add_fields(
@@ -916,7 +925,7 @@ sub run_unimarc_search_tests {
 }
 
 subtest 'MARC21 + DOM' => sub {
-    plan tests => 93;
+    plan tests => 94;
     run_marc21_search_tests();
 };
 
@@ -927,7 +936,7 @@ subtest 'UNIMARC + DOM' => sub {
 
 
 subtest 'FindDuplicate' => sub {
-    plan tests => 6;
+    plan tests => 8;
     Koha::Caches->get_instance('config')->flush_all;
     t::lib::Mocks::mock_preference('marcflavour', 'MARC21' );
     mock_GetMarcSubfieldStructure('MARC21');
@@ -956,6 +965,13 @@ subtest 'FindDuplicate' => sub {
     $record_3->add_fields(
             [ '245', '0', '0', a => 'Frog and toad all year /' ]
     );
+    my $record_4 = MARC::Record->new;
+    $record_4 ->add_fields(
+            [ '020', ' ', ' ', a => '9780307744432' ],
+            [ '020', ' ', ' ', a => '0307744434' ],
+            [ '100', '0', '0', a => 'Morgenstern, Erin' ],
+            [ '245', '0', '0', a => 'The night circus /' ]
+    );
 
     foreach my $engine ('Zebra','Elasticsearch'){
         t::lib::Mocks::mock_preference('searchEngine', $engine );
@@ -968,6 +984,9 @@ subtest 'FindDuplicate' => sub {
 
         warning_is { C4::Search::FindDuplicate($record_3);}
             q/ti,ext:"Frog and toad all year \/"/,"Term correctly formed and passed to $engine";
+
+        warning_is { C4::Search::FindDuplicate($record_4);}
+            q/isbn:9780307744432 OR 0307744434/,"Term correctly formed and passed to $engine";
     }
 
 };