diff --git a/opac/svc/report b/opac/svc/report
index 1ded9c94b0..0b17a4de72 100755
--- a/opac/svc/report
+++ b/opac/svc/report
@@ -24,7 +24,7 @@
 use Modern::Perl;
 
 use C4::Reports::Guided;
-use JSON;
+use JSON::XS;
 use CGI;
 
 use Koha::Cache;
@@ -70,7 +70,7 @@ unless ($json_text) {
         else {
             $lines = $sth->fetchall_arrayref;
         }
-        $json_text = to_json($lines);
+        $json_text = encode_json($lines);
 
         if ($cache_active) {
             $cache->set_in_cache( $cache_key, $json_text,
@@ -78,7 +78,7 @@ unless ($json_text) {
         }
     }
     else {
-        $json_text = to_json($errors);
+        $json_text = encode_json($errors);
     }
 }