diff --git a/catalogue/detail.pl b/catalogue/detail.pl
index 3a22b5db86..f454f22c29 100755
--- a/catalogue/detail.pl
+++ b/catalogue/detail.pl
@@ -152,7 +152,7 @@ if ( $xslfile ) {
     $cleaned_title =~ tr|/||;
     my $query =
       ( C4::Context->preference('UseControlNumber') and $record->field('001') )
-      ? 'rcn:'. $record->field('001')->data . ' and (bib-level:a or bib-level:b)'
+      ? 'rcn:'. $record->field('001')->data . ' AND (bib-level:a OR bib-level:b)'
       : "Host-item:$cleaned_title";
     my ( $err, $result, $count ) = $searcher->simple_search_compat( $query, 0, 0 );
 
diff --git a/opac/opac-detail.pl b/opac/opac-detail.pl
index 4e789cb8b5..8d4723e338 100755
--- a/opac/opac-detail.pl
+++ b/opac/opac-detail.pl
@@ -189,7 +189,7 @@ if ( $xslfile ) {
     $cleaned_title =~ tr|/||;
     my $query =
       ( C4::Context->preference('UseControlNumber') and $record->field('001') )
-      ? 'rcn:'. $record->field('001')->data . ' and (bib-level:a or bib-level:b)'
+      ? 'rcn:'. $record->field('001')->data . ' AND (bib-level:a OR bib-level:b)'
       : "Host-item:$cleaned_title";
     my ( $err, $result, $count ) = $searcher->simple_search_compat( $query, 0, 0 );