diff --git a/Koha/Patron.pm b/Koha/Patron.pm
index cd17d175f2..2bc1998647 100644
--- a/Koha/Patron.pm
+++ b/Koha/Patron.pm
@@ -1814,7 +1814,6 @@ sub to_api_mapping {
         emailpro            => 'secondary_email',
         flags               => undef,    # permissions manipulation handled in /permissions
         gonenoaddress       => 'incorrect_address',
-        guarantorid         => 'guarantor_id',
         lastseen            => 'last_seen',
         lost                => 'patron_card_lost',
         opacnote            => 'opac_notes',
diff --git a/api/v1/swagger/paths/patrons.yaml b/api/v1/swagger/paths/patrons.yaml
index b825bb8c9a..c72e6f8578 100644
--- a/api/v1/swagger/paths/patrons.yaml
+++ b/api/v1/swagger/paths/patrons.yaml
@@ -204,11 +204,6 @@
         description: Filter search by restricted
         required: false
         type: boolean
-      - name: guarantor_id
-        in: query
-        description: Search on guarantor_id
-        required: false
-        type: string
       - name: staff_notes
         in: query
         description: Case insensitive search on staff_notes