diff --git a/cassandane/Cassandane/Cyrus/Carddav.pm b/cassandane/Cassandane/Cyrus/Carddav.pm
index 893a233dc7..4303992bea 100644
--- a/cassandane/Cassandane/Cyrus/Carddav.pm
+++ b/cassandane/Cassandane/Cyrus/Carddav.pm
@@ -1450,4 +1450,27 @@ EOF
     $self->assert_matches(qr/2500 members/, $value);
 }
 
+sub test_delete_default_addressbook
+    :min_version_3_6 :needs_component_httpd
+{
+    my ($self) = @_;
+
+    my $CardDAV = $self->{carddav};
+
+    my %Headers = (
+      'Authorization' => $CardDAV->auth_header()
+    );
+
+    my $Id = $CardDAV->NewAddressBook('foo');
+    $self->assert_not_null($Id);
+
+    my $href = $CardDAV->request_url($Id);
+    my $res = $CardDAV->ua->request('DELETE', $href, { headers => \%Headers });
+    $self->assert_num_equals(204, $res->{status});
+
+    $href = $CardDAV->request_url('Default');
+    $res = $CardDAV->ua->request('DELETE', $href, { headers => \%Headers });
+    $self->assert_num_equals(405, $res->{status});
+}
+
 1;
diff --git a/imap/http_carddav.c b/imap/http_carddav.c
index 64c31ef981..065ce4d893 100644
--- a/imap/http_carddav.c
+++ b/imap/http_carddav.c
@@ -587,9 +587,19 @@ static void my_carddav_shutdown(void)
 static int carddav_parse_path(const char *path, struct request_target_t *tgt,
                               const char **resultstr)
 {
-    return calcarddav_parse_path(path, tgt,
-                                 config_getstring(IMAPOPT_ADDRESSBOOKPREFIX),
-                                 resultstr);
+    int r = calcarddav_parse_path(path, tgt,
+                                  config_getstring(IMAPOPT_ADDRESSBOOKPREFIX),
+                                  resultstr);
+    if (r) return r;
+
+    if (!tgt->resource &&
+        !strncmpsafe(tgt->collection,
+                     DEFAULT_ADDRBOOK "/", strlen(DEFAULT_ADDRBOOK)+1)) {
+        /* Can't delete default addressbook */
+        tgt->allow &= ~ALLOW_DELETE;
+    }
+
+    return 0;
 }
 
 #ifdef HAVE_LIBICALVCARD